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a highly composite number since it has 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.
a refactorable number or tau number, since it has 20 divisors and 20 divides 240.
a highly totient number, since it has 31 totient answers, more than any previous integer.
a pronic number since it can be expressed as the product of two consecutive integers, 15 and 16.
palindromic in bases 19 (CC19), 23 (AA23), 29 (8829), 39 (6639), 47 (5547) and 59 (4459).
a Harshad number in bases 2, 3, 4, 5, 6, 7, 9, 10, 11, 13, 14, 15 (and 73 other bases).
part of the 12161-aliquot tree. The aliquot sequence starting at 120 is: 120, 240, 504, 1056, 1968, 3240, 7650, 14112, 32571, 27333, 12161, 1, 0.
240 is the smallest number that can be expressed as a sum of consecutive primes in three different ways: 240 = 113 + 127 = 53 + 59 + 61 + 67 = 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43. [3]
E8 has 240 roots.
There are 240 distinct solutions of the Soma cube puzzle.[4]
In other fields[]
240 is:
A common voltage in the United Kingdom and Australia before conversion to 230 V standard.
In pre-decimalBritish currency, the number of pence in a pound until 1971.
A cholesterol level of 240 and above is considered high risk.