257402 has 8 divisors (see below), whose sum is σ = 388800. Its totient is φ = 127804.

The previous prime is 257401. The next prime is 257407. The reversal of 257402 is 204752.

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

It is not an unprimeable number, because it can be changed into a prime (257401) 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, 2 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (48600).

2²⁵⁷⁴⁰² is an apocalyptic number.

257402 is a deficient number, since it is larger than the sum of its proper divisors (131398).

257402 is a wasteful number, since it uses less digits than its factorization.

257402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 257402 is about 507.3480067961. The cubic root of 257402 is about 63.6117444656.

Subtracting from 257402 its reverse (204752), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 257402 in words is "two hundred fifty-seven thousand, four hundred two".