257157423 has 24 divisors (see below), whose sum is σ = 386030736. Its totient is φ = 171072000.

The previous prime is 257157409. The next prime is 257157427. The reversal of 257157423 is 324751752.

It is not a de Polignac number, because 257157423 - 2⁶ = 257157359 is a prime.

It is a super-2 number, since 2×257157423² = 132259880408001858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257157427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159823 + ... + 161423.

It is an arithmetic number, because the mean of its divisors is an integer number (16084614).

Almost surely, 2^257157423 is an apocalyptic number.

257157423 is a deficient number, since it is larger than the sum of its proper divisors (128873313).

257157423 is an equidigital number, since it uses as much as digits as its factorization.

257157423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2277 (or 2265 counting only the distinct ones).

The product of its digits is 58800, while the sum is 36.

The square root of 257157423 is about 16036.1286787055. The cubic root of 257157423 is about 635.9159064678.

The spelling of 257157423 in words is "two hundred fifty-seven million, one hundred fifty-seven thousand, four hundred twenty-three".