257885 has 4 divisors (see below), whose sum is σ = 309468. Its totient is φ = 206304.

The previous prime is 257879. The next prime is 257893. The reversal of 257885 is 588752.

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

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 143641 = 338^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 257885 - 2⁴ = 257869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25784 + ... + 25793.

It is an arithmetic number, because the mean of its divisors is an integer number (77367).

2²⁵⁷⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

257885 is a deficient number, since it is larger than the sum of its proper divisors (51583).

257885 is an equidigital number, since it uses as much as digits as its factorization.

257885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51582.

The product of its digits is 22400, while the sum is 35.

The square root of 257885 is about 507.8237883361. The cubic root of 257885 is about 63.6515075276.

The spelling of 257885 in words is "two hundred fifty-seven thousand, eight hundred eighty-five".