257494 has 4 divisors (see below), whose sum is σ = 386244. Its totient is φ = 128746.

The previous prime is 257489. The next prime is 257497. The reversal of 257494 is 494752.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257497) 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 as a sum of consecutive naturals, namely, 64372 + ... + 64375.

It is an arithmetic number, because the mean of its divisors is an integer number (96561).

2²⁵⁷⁴⁹⁴ is an apocalyptic number.

257494 is a deficient number, since it is larger than the sum of its proper divisors (128750).

257494 is a wasteful number, since it uses less digits than its factorization.

257494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128749.

The product of its digits is 10080, while the sum is 31.

The square root of 257494 is about 507.4386662445. The cubic root of 257494 is about 63.6193222148.

The spelling of 257494 in words is "two hundred fifty-seven thousand, four hundred ninety-four".