256399924 has 24 divisors (see below), whose sum is σ = 490240800. Its totient is φ = 116366880.

The previous prime is 256399901. The next prime is 256399939. The reversal of 256399924 is 429993652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27087 + ... + 35305.

It is an arithmetic number, because the mean of its divisors is an integer number (20426700).

Almost surely, 2^256399924 is an apocalyptic number.

It is an amenable number.

256399924 is a deficient number, since it is larger than the sum of its proper divisors (233840876).

256399924 is a wasteful number, since it uses less digits than its factorization.

256399924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8943 (or 8941 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 49.

The square root of 256399924 is about 16012.4927478516. The cubic root of 256399924 is about 635.2908944758.

The spelling of 256399924 in words is "two hundred fifty-six million, three hundred ninety-nine thousand, nine hundred twenty-four".