639130023 has 24 divisors (see below), whose sum is σ = 1056290976. Its totient is φ = 364795200.

The previous prime is 639130013. The next prime is 639130031. The reversal of 639130023 is 320031936.

639130023 is a `hidden beast` number, since 639 + 1 + 3 + 0 + 0 + 23 = 666.

It is not a de Polignac number, because 639130023 - 2⁸ = 639129767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639130013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53893 + ... + 64673.

It is an arithmetic number, because the mean of its divisors is an integer number (44012124).

Almost surely, 2^639130023 is an apocalyptic number.

639130023 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

639130023 is a deficient number, since it is larger than the sum of its proper divisors (417160953).

639130023 is a wasteful number, since it uses less digits than its factorization.

639130023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11735 (or 11732 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

The square root of 639130023 is about 25281.0210039073. The cubic root of 639130023 is about 861.3832179828.

Adding to 639130023 its reverse (320031936), we get a palindrome (959161959).

The spelling of 639130023 in words is "six hundred thirty-nine million, one hundred thirty thousand, twenty-three".