257996421 has 40 divisors (see below), whose sum is σ = 413471520. Its totient is φ = 159820128.

The previous prime is 257996419. The next prime is 257996447. The reversal of 257996421 is 124699752.

257996421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 257996421 - 2¹ = 257996419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257996411) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 79986 + ... + 83148.

It is an arithmetic number, because the mean of its divisors is an integer number (10336788).

Almost surely, 2^257996421 is an apocalyptic number.

257996421 is the 8586-th nonagonal number.

It is an amenable number.

257996421 is a deficient number, since it is larger than the sum of its proper divisors (155475099).

257996421 is a wasteful number, since it uses less digits than its factorization.

257996421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247 (or 3238 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 257996421 is about 16062.2669944189. The cubic root of 257996421 is about 636.6067323252.

The spelling of 257996421 in words is "two hundred fifty-seven million, nine hundred ninety-six thousand, four hundred twenty-one".