657983139 has 8 divisors (see below), whose sum is σ = 957066432. Its totient is φ = 398777640.

The previous prime is 657983093. The next prime is 657983143. The reversal of 657983139 is 931389756.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 657983139 - 2⁹ = 657982627 is a prime.

It is a super-2 number, since 2×657983139² = 865883622416586642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 657983091 and 657983100.

It is not an unprimeable number, because it can be changed into a prime (657983159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9969409 + ... + 9969474.

It is an arithmetic number, because the mean of its divisors is an integer number (119633304).

Almost surely, 2^657983139 is an apocalyptic number.

657983139 is a deficient number, since it is larger than the sum of its proper divisors (299083293).

657983139 is a wasteful number, since it uses less digits than its factorization.

657983139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19938897.

The product of its digits is 1224720, while the sum is 51.

The square root of 657983139 is about 25651.1820195483. The cubic root of 657983139 is about 869.7709966693.

The spelling of 657983139 in words is "six hundred fifty-seven million, nine hundred eighty-three thousand, one hundred thirty-nine".