257995 has 4 divisors (see below), whose sum is σ = 309600. Its totient is φ = 206392.

The previous prime is 257993. The next prime is 258019. The reversal of 257995 is 599752.

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 257995 - 2¹ = 257993 is a prime.

It is a super-2 number, since 2×257995² = 133122840050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25795 + ... + 25804.

It is an arithmetic number, because the mean of its divisors is an integer number (77400).

2²⁵⁷⁹⁹⁵ is an apocalyptic number.

257995 is a deficient number, since it is larger than the sum of its proper divisors (51605).

257995 is an equidigital number, since it uses as much as digits as its factorization.

257995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51604.

The product of its digits is 28350, while the sum is 37.

The square root of 257995 is about 507.9320820740. The cubic root of 257995 is about 63.6605563550.

The spelling of 257995 in words is "two hundred fifty-seven thousand, nine hundred ninety-five".