257490023 has 4 divisors (see below), whose sum is σ = 294274320. Its totient is φ = 220705728.

The previous prime is 257490011. The next prime is 257490031. The reversal of 257490023 is 320094752.

It is a happy number.

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 257490023 - 2¹⁸ = 257227879 is a prime.

It is a super-2 number, since 2×257490023² = 132602223889081058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257490073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18392138 + ... + 18392151.

It is an arithmetic number, because the mean of its divisors is an integer number (73568580).

Almost surely, 2^257490023 is an apocalyptic number.

257490023 is a deficient number, since it is larger than the sum of its proper divisors (36784297).

257490023 is an equidigital number, since it uses as much as digits as its factorization.

257490023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36784296.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 257490023 is about 16046.4956610470. The cubic root of 257490023 is about 636.1899467922.

The spelling of 257490023 in words is "two hundred fifty-seven million, four hundred ninety thousand, twenty-three".