257842 has 16 divisors (see below), whose sum is σ = 427392. Its totient is φ = 115920.

The previous prime is 257837. The next prime is 257857. The reversal of 257842 is 248752.

It is a self number, because there is not a number n which added to its sum of digits gives 257842.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1117 + ... + 1327.

It is an arithmetic number, because the mean of its divisors is an integer number (26712).

2²⁵⁷⁸⁴² is an apocalyptic number.

257842 is a deficient number, since it is larger than the sum of its proper divisors (169550).

257842 is a wasteful number, since it uses less digits than its factorization.

257842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273.

The product of its digits is 4480, while the sum is 28.

The square root of 257842 is about 507.7814490507. The cubic root of 257842 is about 63.6479695591.

The spelling of 257842 in words is "two hundred fifty-seven thousand, eight hundred forty-two".