257697 has 24 divisors (see below), whose sum is σ = 430560. Its totient is φ = 146880.

The previous prime is 257689. The next prime is 257707. The reversal of 257697 is 796752.

It is not a de Polignac number, because 257697 - 2³ = 257689 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1813 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (17940).

2²⁵⁷⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

257697 is a deficient number, since it is larger than the sum of its proper divisors (172863).

257697 is a wasteful number, since it uses less digits than its factorization.

257697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 170 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 257697 is about 507.6386510107. The cubic root of 257697 is about 63.6360363001.

The spelling of 257697 in words is "two hundred fifty-seven thousand, six hundred ninety-seven".