639379900 has 36 divisors (see below), whose sum is σ = 1419730312. Its totient is φ = 249802560.

The previous prime is 639379889. The next prime is 639379901. The reversal of 639379900 is 9973936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639379901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70047 + ... + 78646.

Almost surely, 2^639379900 is an apocalyptic number.

It is an amenable number.

639379900 is an abundant number, since it is smaller than the sum of its proper divisors (780350412).

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

639379900 is a wasteful number, since it uses less digits than its factorization.

639379900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148750 (or 148743 counting only the distinct ones).

The product of its (nonzero) digits is 275562, while the sum is 46.

The square root of 639379900 is about 25285.9625088704. The cubic root of 639379900 is about 861.4954600422.

It can be divided in two parts, 63937 and 9900, that added together give a palindrome (73837).

The spelling of 639379900 in words is "six hundred thirty-nine million, three hundred seventy-nine thousand, nine hundred".