256120940 has 24 divisors (see below), whose sum is σ = 539596512. Its totient is φ = 102116480.

The previous prime is 256120903. The next prime is 256120957. The reversal of 256120940 is 49021652.

It is a happy number.

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, 14369 + ... + 26808.

It is an arithmetic number, because the mean of its divisors is an integer number (22483188).

Almost surely, 2^256120940 is an apocalyptic number.

256120940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256120940 is an abundant number, since it is smaller than the sum of its proper divisors (283475572).

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

256120940 is a wasteful number, since it uses less digits than its factorization.

256120940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41497 (or 41495 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 256120940 is about 16003.7789287405. The cubic root of 256120940 is about 635.0603947765.

The spelling of 256120940 in words is "two hundred fifty-six million, one hundred twenty thousand, nine hundred forty".