639413308 has 18 divisors (see below), whose sum is σ = 1180968936. Its totient is φ = 302879304.

The previous prime is 639413287. The next prime is 639413309. The reversal of 639413308 is 803314936.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639413309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219960 + ... + 222847.

Almost surely, 2^639413308 is an apocalyptic number.

It is an amenable number.

639413308 is a deficient number, since it is larger than the sum of its proper divisors (541555628).

639413308 is a wasteful number, since it uses less digits than its factorization.

639413308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442849 (or 442828 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 639413308 is about 25286.6231039259. The cubic root of 639413308 is about 861.5104643399.

The spelling of 639413308 in words is "six hundred thirty-nine million, four hundred thirteen thousand, three hundred eight".