257627421 has 12 divisors (see below), whose sum is σ = 373688640. Its totient is φ = 171031560.

The previous prime is 257627399. The next prime is 257627449. The reversal of 257627421 is 124726752.

It is a happy number.

257627421 is a `hidden beast` number, since 2 + 5 + 7 + 627 + 4 + 21 = 666.

It is not a de Polignac number, because 257627421 - 2⁵ = 257627389 is a prime.

It is a super-2 number, since 2×257627421² = 132743776102222482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257607421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57735 + ... + 62036.

It is an arithmetic number, because the mean of its divisors is an integer number (31140720).

Almost surely, 2^257627421 is an apocalyptic number.

It is an amenable number.

257627421 is a deficient number, since it is larger than the sum of its proper divisors (116061219).

257627421 is a wasteful number, since it uses less digits than its factorization.

257627421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120016 (or 120013 counting only the distinct ones).

The product of its digits is 47040, while the sum is 36.

The square root of 257627421 is about 16050.7763363645. The cubic root of 257627421 is about 636.3030847463.

The spelling of 257627421 in words is "two hundred fifty-seven million, six hundred twenty-seven thousand, four hundred twenty-one".