257979 has 8 divisors (see below), whose sum is σ = 347472. Its totient is φ = 170240.

The previous prime is 257953. The next prime is 257981. The reversal of 257979 is 979752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 257979 - 2⁵ = 257947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42 + ... + 719.

It is an arithmetic number, because the mean of its divisors is an integer number (43434).

2²⁵⁷⁹⁷⁹ is an apocalyptic number.

257979 is a deficient number, since it is larger than the sum of its proper divisors (89493).

257979 is a wasteful number, since it uses less digits than its factorization.

257979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877.

The product of its digits is 39690, while the sum is 39.

The square root of 257979 is about 507.9163316925. The cubic root of 257979 is about 63.6592403217.

The spelling of 257979 in words is "two hundred fifty-seven thousand, nine hundred seventy-nine".