257695 has 4 divisors (see below), whose sum is σ = 309240. Its totient is φ = 206152.

The previous prime is 257689. The next prime is 257707. The reversal of 257695 is 596752.

257695 = 124² + 125² + ... + 138².

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

It is a cyclic number.

It is not a de Polignac number, because 257695 - 2³ = 257687 is a prime.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 257695.

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, 25765 + ... + 25774.

It is an arithmetic number, because the mean of its divisors is an integer number (77310).

2²⁵⁷⁶⁹⁵ is an apocalyptic number.

257695 is a deficient number, since it is larger than the sum of its proper divisors (51545).

257695 is an equidigital number, since it uses as much as digits as its factorization.

257695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51544.

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

The square root of 257695 is about 507.6366811018. The cubic root of 257695 is about 63.6358716721.

The spelling of 257695 in words is "two hundred fifty-seven thousand, six hundred ninety-five".