1657138992 has 40 divisors (see below), whose sum is σ = 4296890160. Its totient is φ = 550321920.

The previous prime is 1657138961. The next prime is 1657139009. The reversal of 1657138992 is 2998317561.

It is a super-2 number, since 2×1657138992² = 5492219277613552128, which contains 22 as substring.

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, 51259 + ... + 77082.

It is an arithmetic number, because the mean of its divisors is an integer number (107422254).

Almost surely, 2^1657138992 is an apocalyptic number.

1657138992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1657138992 is an abundant number, since it is smaller than the sum of its proper divisors (2639751168).

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

1657138992 is a wasteful number, since it uses less digits than its factorization.

1657138992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128621 (or 128615 counting only the distinct ones).

The product of its digits is 816480, while the sum is 51.

The square root of 1657138992 is about 40707.9720939277. The cubic root of 1657138992 is about 1183.3675211882.

The spelling of 1657138992 in words is "one billion, six hundred fifty-seven million, one hundred thirty-eight thousand, nine hundred ninety-two".