639857116 has 12 divisors (see below), whose sum is σ = 1120030632. Its totient is φ = 319848368.

The previous prime is 639857083. The next prime is 639857117. The reversal of 639857116 is 611758936.

It is a happy number.

639857116 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639857117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171 + ... + 35773.

It is an arithmetic number, because the mean of its divisors is an integer number (93335886).

Almost surely, 2^639857116 is an apocalyptic number.

It is an amenable number.

639857116 is a deficient number, since it is larger than the sum of its proper divisors (480173516).

639857116 is a wasteful number, since it uses less digits than its factorization.

639857116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40100 (or 40098 counting only the distinct ones).

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

The square root of 639857116 is about 25295.3971307034. The cubic root of 639857116 is about 861.7097391049.

The spelling of 639857116 in words is "six hundred thirty-nine million, eight hundred fifty-seven thousand, one hundred sixteen".