256399926 has 8 divisors (see below), whose sum is σ = 512799864. Its totient is φ = 85466640.

The previous prime is 256399901. The next prime is 256399939. The reversal of 256399926 is 629993652.

256399926 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

256399926 is an admirable number.

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, 21366655 + ... + 21366666.

It is an arithmetic number, because the mean of its divisors is an integer number (64099983).

Almost surely, 2^256399926 is an apocalyptic number.

256399926 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.

256399926 is a wasteful number, since it uses less digits than its factorization.

256399926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42733326.

The product of its digits is 1574640, while the sum is 51.

The square root of 256399926 is about 16012.4928103028. The cubic root of 256399926 is about 635.2908961277.

The spelling of 256399926 in words is "two hundred fifty-six million, three hundred ninety-nine thousand, nine hundred twenty-six".