257885939 has 2 divisors, whose sum is σ = 257885940. Its totient is φ = 257885938.

The previous prime is 257885933. The next prime is 257885981. The reversal of 257885939 is 939588752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257885939 - 2²⁴ = 241108723 is a prime.

It is not a weakly prime, because it can be changed into another prime (257885933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128942969 + 128942970.

It is an arithmetic number, because the mean of its divisors is an integer number (128942970).

Almost surely, 2^257885939 is an apocalyptic number.

257885939 is a deficient number, since it is larger than the sum of its proper divisors (1).

257885939 is an equidigital number, since it uses as much as digits as its factorization.

257885939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 56.

The square root of 257885939 is about 16058.8274478556. The cubic root of 257885939 is about 636.5158478253.

The spelling of 257885939 in words is "two hundred fifty-seven million, eight hundred eighty-five thousand, nine hundred thirty-nine".