256312940 has 24 divisors (see below), whose sum is σ = 579662160. Its totient is φ = 94638528.

The previous prime is 256312873. The next prime is 256312967. The reversal of 256312940 is 49213652.

It is a happy number.

256312940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256312940² = 131392646422887200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256312897 and 256312906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 492650 + ... + 493169.

It is an arithmetic number, because the mean of its divisors is an integer number (24152590).

Almost surely, 2^256312940 is an apocalyptic number.

256312940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256312940 is an abundant number, since it is smaller than the sum of its proper divisors (323349220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256312940 is a wasteful number, since it uses less digits than its factorization.

256312940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985841 (or 985839 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 256312940 is about 16009.7763881948. The cubic root of 256312940 is about 635.2190452692.

The spelling of 256312940 in words is "two hundred fifty-six million, three hundred twelve thousand, nine hundred forty".