240 (number)

240 (number)

240 ("two hundred [and] forty") is the natural number following 239 and preceding 241.

In mathematics

With 20 divisors total (1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 40, 48, 60, 80, 120, and 240), more than any previous number, 240 is a highly composite number, and it is also a refactorable number or tau number, since with 20 divisors and 20 divides 240. And since it has 31 totient answers, more than any previous integer, 240 is a highly totient number.

240 is a semiperfect number.

240 can be expressed as a sum of consecutive primes in two different ways: 240 = 53 + 59 + 61 + 67 = 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43. It can also be expressed as the product of two consecutive integers, 15 and 16, thus 240 is a pronic number.

Also, being divisible by the sum of its digits, 240 is a Harshad number, and not only that, it is also a concatenation of two of its proper divisors (see Sloane's A50480).

"E"8 has 240 roots.

There are 240 distinct solutions of the Soma cube puzzle.

In other fields

240 is:
* A common voltage in England and Australia before conversion to 230V standard.
* In British currency, the number of pence in a pound until 1971.
* A cholesterol level of 240 and above is considered high risk.
* The model number of the Convair 240.
* The year A.D. 240 or 240 BC.
* Nissan 240SX
* Volvo 240
* An area code overlay of the 301 area code in western Maryland.
* The famous skit by the sketch comedy group The State is entitled "$240 Dollars Worth of Pudding"

Other numbers from 241 to 249

----
241 (two hundred forty-one) has its own article.----
242 (two hundred forty-two) has its own article.----Two hundred forty-three 243 = 35, perfect totient number, sum of five consecutive primes (41 + 43 + 47 + 53 + 59), Harshad number----Two hundred forty-four 244 = 22·61, nontotient, noncototient, self number----
245 (two hundred forty-five) has its own article.----Two hundred forty-five 245 = 5·72. In the MARC format for records in online public access (library) catalogs, in which each type of information about a book (or other library material) is identified with a 3-digit number, 245 identifies the title of the item; most library catalog software requires that each record have at least a 245 tag, even if no other information is entered about the item.----Two hundred forty-six 246 = 2·3·41, sphenic number, nontotient, untouchable number.----Two hundred forty-seven 247 = 13·19, pentagonal number

Sometime (when it is a URL, etc.) may use "247" as an alternate to 24/7, it is an abbreviation which stands for "24 hours a day, 7 days a week".----Two hundred forty-eight 248 = 23·31, nontotient, untouchable number, refactorable number; "E"8 has complex dimension 248.----Two hundred forty-nine 249 = 3·83, Blum integer


Wikimedia Foundation. 2010.

Нужен реферат?

Look at other dictionaries:

  • Number Ones: Up Close and Personal — World Tour Official poster for the tour Tour by Janet Jackson Associated album Number Ones …   Wikipedia

  • Number Ones (DVD) — Number Ones Video de Michael Jackson Publicación 18 de Noviembre de 2003 Género(s) Pop Duración 91 min. Discográfica …   Wikipedia Español

  • 240 mm howitzer M1 — Infobox Weapon is artillery=yes name=240 mm howitzer M1 caption=Front view of a 240 mm howitzer firing into German held territory. Mignano area, Italy. January 30, 1944 origin=United States type=Howitzerservice= 1943 late 1950s used by=flag|USA… …   Wikipedia

  • .240 Apex — Infobox Firearm Cartridge name= .240 Apex caption= origin= England type= Rifle service= used by= wars= designer= Holland Holland design date=1920 manufacturer=Holland Holland production date= number= variants= .240 Flanged is SI specs= parent=… …   Wikipedia

  • 240 mm Trench Mortar — Infobox Weapon name=240 mm Trench Mortar caption=240 mm Trench Mortar, side view origin=FRA type= Heavy trench mortar is ranged=yes is bladed= is explosive=yes is artillery=yes is UK=yes is vehicle= target= date= prod date= number= service=1915… …   Wikipedia

  • .240 Weatherby Magnum — Infobox Firearm Cartridge name= .240 Weatherby Magnum caption= origin= USA type= Rifle service= used by= wars= designer= Roy Weatherby design date=1968 manufacturer=Weatherby production date= number= variants= is SI specs= parent= case… …   Wikipedia

  • Number — For other uses, see Numbers (disambiguation). A number is a mathematical object used to count and measure. In mathematics, the definition of number has been extended over the years to include such numbers as zero, negative numbers, rational… …   Wikipedia

  • 10000 (number) — Number number = 10000 prev = 9999 next = 100000 range = 10000 100000 cardinal = 10000 ordinal = th ordinal text = ten thousandth numeral = decamillesimal factorization = 2^4 cdot 5^4 prime = divisor = roman = overline|X unicode = overline|X, ↂ… …   Wikipedia

  • 30000 (number) — Number number = 30000 range = 10000 100000 cardinal = 30000 ordinal = th ordinal text = thirty thousandth factorization = 2^4 cdot 3 cdot 5^4 bin = 111010100110000 oct = 72460 hex = 753030,000 (thirty thousand) is the number that comes after… …   Wikipedia

  • Wikipedia:List of Wikipedians by number of edits — Shortcuts: WP:NOE WP:WBE WP:EDITS WP:MOSTEDITS This is a list of Wikipedians ordered by number of edits in the English language Wikipedia. Edits in all namespaces are counted; deleted edits have been included in recent versions. Click… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”