256632939 has 6 divisors (see below), whose sum is σ = 370692036. Its totient is φ = 171088620.

The previous prime is 256632931. The next prime is 256632941. The reversal of 256632939 is 939236652.

256632939 is a `hidden beast` number, since 2 + 5 + 6 + 632 + 9 + 3 + 9 = 666.

It is not a de Polignac number, because 256632939 - 2³ = 256632931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256632894 and 256632903.

It is not an unprimeable number, because it can be changed into a prime (256632931) 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, 14257377 + ... + 14257394.

It is an arithmetic number, because the mean of its divisors is an integer number (61782006).

Almost surely, 2^256632939 is an apocalyptic number.

256632939 is a deficient number, since it is larger than the sum of its proper divisors (114059097).

256632939 is a wasteful number, since it uses less digits than its factorization.

256632939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28514777 (or 28514774 counting only the distinct ones).

The product of its digits is 524880, while the sum is 45.

The square root of 256632939 is about 16019.7671331390. The cubic root of 256632939 is about 635.4832859613.

The spelling of 256632939 in words is "two hundred fifty-six million, six hundred thirty-two thousand, nine hundred thirty-nine".