257965 has 4 divisors (see below), whose sum is σ = 309564. Its totient is φ = 206368.

The previous prime is 257953. The next prime is 257981. The reversal of 257965 is 569752.

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 198916 + 59049 = 446^2 + 243^2 .

It is a cyclic number.

It is not a de Polignac number, because 257965 - 2⁷ = 257837 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257965.

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, 25792 + ... + 25801.

It is an arithmetic number, because the mean of its divisors is an integer number (77391).

2²⁵⁷⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

257965 is a deficient number, since it is larger than the sum of its proper divisors (51599).

257965 is an equidigital number, since it uses as much as digits as its factorization.

257965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51598.

The product of its digits is 18900, while the sum is 34.

The square root of 257965 is about 507.9025497081. The cubic root of 257965 is about 63.6580887481.

The spelling of 257965 in words is "two hundred fifty-seven thousand, nine hundred sixty-five".