257318 has 4 divisors (see below), whose sum is σ = 385980. Its totient is φ = 128658.

The previous prime is 257311. The next prime is 257321. The reversal of 257318 is 813752.

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

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257311) 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 as a sum of consecutive naturals, namely, 64328 + ... + 64331.

It is an arithmetic number, because the mean of its divisors is an integer number (96495).

2²⁵⁷³¹⁸ is an apocalyptic number.

257318 is a deficient number, since it is larger than the sum of its proper divisors (128662).

257318 is a wasteful number, since it uses less digits than its factorization.

257318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128661.

The product of its digits is 1680, while the sum is 26.

The square root of 257318 is about 507.2652166274. The cubic root of 257318 is about 63.6048240740.

It can be divided in two parts, 257 and 318, that added together give a palindrome (575).

The spelling of 257318 in words is "two hundred fifty-seven thousand, three hundred eighteen".