257479 has 4 divisors (see below), whose sum is σ = 258984. Its totient is φ = 255976.

The previous prime is 257473. The next prime is 257489. The reversal of 257479 is 974752.

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 257479 - 2⁵ = 257447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (64746).

2²⁵⁷⁴⁷⁹ is an apocalyptic number.

257479 is a deficient number, since it is larger than the sum of its proper divisors (1505).

257479 is a wasteful number, since it uses less digits than its factorization.

257479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504.

The product of its digits is 17640, while the sum is 34.

The square root of 257479 is about 507.4238859179. The cubic root of 257479 is about 63.6180868354.

The spelling of 257479 in words is "two hundred fifty-seven thousand, four hundred seventy-nine".