256399892 has 12 divisors (see below), whose sum is σ = 512799840. Its totient is φ = 109885656.

The previous prime is 256399877. The next prime is 256399901. The reversal of 256399892 is 298993652.

256399892 is an admirable number.

It is a super-2 number, since 2×256399892² = 131481809235223328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4578542 + ... + 4578597.

It is an arithmetic number, because the mean of its divisors is an integer number (42733320).

Almost surely, 2^256399892 is an apocalyptic number.

It is an amenable number.

256399892 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256399892 is a wasteful number, since it uses less digits than its factorization.

256399892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9157150 (or 9157148 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 53.

The square root of 256399892 is about 16012.4917486318. The cubic root of 256399892 is about 635.2908680467.

The spelling of 256399892 in words is "two hundred fifty-six million, three hundred ninety-nine thousand, eight hundred ninety-two".