257139140 has 24 divisors (see below), whose sum is σ = 552552000. Its totient is φ = 100463328.

The previous prime is 257139137. The next prime is 257139193. The reversal of 257139140 is 41931752.

257139140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×257139140² = 132241074639879200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 257139097 and 257139106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148640 + ... + 150359.

It is an arithmetic number, because the mean of its divisors is an integer number (23023000).

Almost surely, 2^257139140 is an apocalyptic number.

257139140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257139140 is an abundant number, since it is smaller than the sum of its proper divisors (295412860).

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

257139140 is a wasteful number, since it uses less digits than its factorization.

257139140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299051 (or 299049 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 257139140 is about 16035.5586120347. The cubic root of 257139140 is about 635.9008356395.

The spelling of 257139140 in words is "two hundred fifty-seven million, one hundred thirty-nine thousand, one hundred forty".