257421380 has 24 divisors (see below), whose sum is σ = 544846848. Its totient is φ = 102156768.

The previous prime is 257421379. The next prime is 257421383. The reversal of 257421380 is 83124752.

It is a super-2 number, since 2×257421380² = 132531533762208800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257421383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48134 + ... + 53213.

It is an arithmetic number, because the mean of its divisors is an integer number (22701952).

Almost surely, 2^257421380 is an apocalyptic number.

257421380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257421380 is an abundant number, since it is smaller than the sum of its proper divisors (287425468).

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

257421380 is a wasteful number, since it uses less digits than its factorization.

257421380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101483 (or 101481 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 257421380 is about 16044.3566402645. The cubic root of 257421380 is about 636.1334088505.

The spelling of 257421380 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, three hundred eighty".