257388 has 24 divisors (see below), whose sum is σ = 609840. Its totient is φ = 84480.

The previous prime is 257381. The next prime is 257399. The reversal of 257388 is 883752.

It is a nialpdrome in base 8.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 257388.

It is not an unprimeable number, because it can be changed into a prime (257381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 948 + ... + 1188.

It is an arithmetic number, because the mean of its divisors is an integer number (25410).

2²⁵⁷³⁸⁸ is an apocalyptic number.

It is an amenable number.

257388 is an abundant number, since it is smaller than the sum of its proper divisors (352452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257388 is a wasteful number, since it uses less digits than its factorization.

257388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 335 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 257388 is about 507.3342093729. The cubic root of 257388 is about 63.6105911716.

The spelling of 257388 in words is "two hundred fifty-seven thousand, three hundred eighty-eight".