256975838 has 16 divisors (see below), whose sum is σ = 446736384. Its totient is φ = 108580920.

The previous prime is 256975813. The next prime is 256975843. The reversal of 256975838 is 838579652.

It is a self number, because there is not a number n which added to its sum of digits gives 256975838.

It is a congruent 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, 128270 + ... + 130257.

It is an arithmetic number, because the mean of its divisors is an integer number (27921024).

Almost surely, 2^256975838 is an apocalyptic number.

256975838 is a deficient number, since it is larger than the sum of its proper divisors (189760546).

256975838 is a wasteful number, since it uses less digits than its factorization.

256975838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258607.

The product of its digits is 3628800, while the sum is 53.

The square root of 256975838 is about 16030.4659320932. The cubic root of 256975838 is about 635.7661927521.

Subtracting from 256975838 its sum of digits (53), we obtain a triangular number (256975785 = T₂₂₆₇₀).

The spelling of 256975838 in words is "two hundred fifty-six million, nine hundred seventy-five thousand, eight hundred thirty-eight".