256975839 has 6 divisors (see below), whose sum is σ = 371187336. Its totient is φ = 171317220.

The previous prime is 256975813. The next prime is 256975843. The reversal of 256975839 is 938579652.

256975839 is a `hidden beast` number, since 2 + 56 + 9 + 7 + 583 + 9 = 666.

It is not a de Polignac number, because 256975839 - 2¹¹ = 256973791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256975889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14276427 + ... + 14276444.

It is an arithmetic number, because the mean of its divisors is an integer number (61864556).

Almost surely, 2^256975839 is an apocalyptic number.

256975839 is a deficient number, since it is larger than the sum of its proper divisors (114211497).

256975839 is a wasteful number, since it uses less digits than its factorization.

256975839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28552877 (or 28552874 counting only the distinct ones).

The product of its digits is 4082400, while the sum is 54.

The square root of 256975839 is about 16030.4659632838. The cubic root of 256975839 is about 635.7661935768.

Subtracting from 256975839 its sum of digits (54), we obtain a triangular number (256975785 = T₂₂₆₇₀).

The spelling of 256975839 in words is "two hundred fifty-six million, nine hundred seventy-five thousand, eight hundred thirty-nine".