257943984 has 20 divisors (see below), whose sum is σ = 666355416. Its totient is φ = 85981312.

The previous prime is 257943979. The next prime is 257943991. The reversal of 257943984 is 489349752.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2686869 + ... + 2686964.

Almost surely, 2^257943984 is an apocalyptic number.

257943984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

257943984 is an abundant number, since it is smaller than the sum of its proper divisors (408411432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257943984 is a wasteful number, since it uses less digits than its factorization.

257943984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5373844 (or 5373838 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The square root of 257943984 is about 16060.6346076362. The cubic root of 257943984 is about 636.5635999322.

The spelling of 257943984 in words is "two hundred fifty-seven million, nine hundred forty-three thousand, nine hundred eighty-four".