- 240 (number)
**240**("two hundred [and] forty") is thenatural 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 arefactorable 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 ahighly 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 commonvoltage inEngland andAustralia before conversion to 230V standard.

* In British currency, the number of pence in a pound until 1971.

* Acholesterol level of 240 and above is considered high risk.

* The model number of theConvair 240 .

* The year A.D.240 or240 BC .

*Nissan 240SX

*Volvo 240

* Anarea code overlay of the 301 area code in westernMaryland .

* The famous skit by the sketch comedy groupThe 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 = 3^{5},perfect totient number , sum of five consecutive primes (41 + 43 + 47 + 53 + 59),Harshad number ----Two hundred forty-four 244 = 2^{2}·61, nontotient, noncototient, self number----

245 (two hundred forty-five) has its own article.----Two hundred forty-five 245 = 5·7^{2}. 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 = 2^{3}·31, nontotient, untouchable number, refactorable number; "E"_{8}hascomplex dimension 248.----Two hundred forty-nine 249 = 3·83,Blum integer

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