639386376 has 16 divisors (see below), whose sum is σ = 1598466000. Its totient is φ = 213128784.

The previous prime is 639386357. The next prime is 639386383. The reversal of 639386376 is 673683936.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13320526 + ... + 13320573.

It is an arithmetic number, because the mean of its divisors is an integer number (99904125).

Almost surely, 2^639386376 is an apocalyptic number.

It is an amenable number.

639386376 is an abundant number, since it is smaller than the sum of its proper divisors (959079624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639386376 is a wasteful number, since it uses less digits than its factorization.

639386376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26641108 (or 26641104 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 51.

The square root of 639386376 is about 25286.0905637862. The cubic root of 639386376 is about 861.4983686029.

The spelling of 639386376 in words is "six hundred thirty-nine million, three hundred eighty-six thousand, three hundred seventy-six".