257421512 has 16 divisors (see below), whose sum is σ = 488481840. Its totient is φ = 127159696.

The previous prime is 257421509. The next prime is 257421517. The reversal of 257421512 is 215124752.

It is a happy number.

It is a super-2 number, since 2×257421512² = 132531669680732288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257421517) 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, 193178 + ... + 194505.

It is an arithmetic number, because the mean of its divisors is an integer number (30530115).

Almost surely, 2^257421512 is an apocalyptic number.

It is an amenable number.

257421512 is a deficient number, since it is larger than the sum of its proper divisors (231060328).

257421512 is a wasteful number, since it uses less digits than its factorization.

257421512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387772 (or 387768 counting only the distinct ones).

The product of its digits is 5600, while the sum is 29.

The square root of 257421512 is about 16044.3607538599. The cubic root of 257421512 is about 636.1335175822.

The spelling of 257421512 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, five hundred twelve".