639931102 has 16 divisors (see below), whose sum is σ = 1018457712. Its totient is φ = 300522880.

The previous prime is 639931099. The next prime is 639931121. The reversal of 639931102 is 201139936.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2473 + ... + 35860.

It is an arithmetic number, because the mean of its divisors is an integer number (63653607).

Almost surely, 2^639931102 is an apocalyptic number.

639931102 is a deficient number, since it is larger than the sum of its proper divisors (378526610).

639931102 is a wasteful number, since it uses less digits than its factorization.

639931102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38843.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 639931102 is about 25296.8595284079. The cubic root of 639931102 is about 861.7429506861.

The spelling of 639931102 in words is "six hundred thirty-nine million, nine hundred thirty-one thousand, one hundred two".