256257939 has 16 divisors (see below), whose sum is σ = 391305728. Its totient is φ = 146126592.

The previous prime is 256257931. The next prime is 256257943. The reversal of 256257939 is 939752652.

It is not a de Polignac number, because 256257939 - 2³ = 256257931 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256257931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2302 + ... + 22755.

It is an arithmetic number, because the mean of its divisors is an integer number (24456608).

Almost surely, 2^256257939 is an apocalyptic number.

256257939 is a deficient number, since it is larger than the sum of its proper divisors (135047789).

256257939 is a wasteful number, since it uses less digits than its factorization.

256257939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25554.

The product of its digits is 1020600, while the sum is 48.

The square root of 256257939 is about 16008.0585643606. The cubic root of 256257939 is about 635.1736057867.

The spelling of 256257939 in words is "two hundred fifty-six million, two hundred fifty-seven thousand, nine hundred thirty-nine".