257421436 has 12 divisors (see below), whose sum is σ = 451058328. Its totient is φ = 128547632.

The previous prime is 257421431. The next prime is 257421457. The reversal of 257421436 is 634124752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257421431) 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, 37186 + ... + 43561.

It is an arithmetic number, because the mean of its divisors is an integer number (37588194).

Almost surely, 2^257421436 is an apocalyptic number.

It is an amenable number.

257421436 is a deficient number, since it is larger than the sum of its proper divisors (193636892).

257421436 is a wasteful number, since it uses less digits than its factorization.

257421436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81548 (or 81546 counting only the distinct ones).

The product of its digits is 40320, while the sum is 34.

The square root of 257421436 is about 16044.3583854263. The cubic root of 257421436 is about 636.1334549791.

The spelling of 257421436 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, four hundred thirty-six".