257902 has 4 divisors (see below), whose sum is σ = 386856. Its totient is φ = 128950.

The previous prime is 257893. The next prime is 257903. The reversal of 257902 is 209752.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64474 + ... + 64477.

It is an arithmetic number, because the mean of its divisors is an integer number (96714).

2²⁵⁷⁹⁰² is an apocalyptic number.

257902 is a deficient number, since it is larger than the sum of its proper divisors (128954).

257902 is a wasteful number, since it uses less digits than its factorization.

257902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128953.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 257902 is about 507.8405261497. The cubic root of 257902 is about 63.6529061508.

The spelling of 257902 in words is "two hundred fifty-seven thousand, nine hundred two".