639658117 has 12 divisors (see below), whose sum is σ = 743666656. Its totient is φ = 538965000.

The previous prime is 639658093. The next prime is 639658127. The reversal of 639658117 is 711856936.

It is a happy number.

It is not a de Polignac number, because 639658117 - 2²⁷ = 505440389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639658127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11242 + ... + 37492.

Almost surely, 2^639658117 is an apocalyptic number.

It is an amenable number.

639658117 is a deficient number, since it is larger than the sum of its proper divisors (104008539).

639658117 is an equidigital number, since it uses as much as digits as its factorization.

639658117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26376 (or 26317 counting only the distinct ones).

The product of its digits is 272160, while the sum is 46.

The square root of 639658117 is about 25291.4633226312. The cubic root of 639658117 is about 861.6203977232.

The spelling of 639658117 in words is "six hundred thirty-nine million, six hundred fifty-eight thousand, one hundred seventeen".