639854900 has 36 divisors (see below), whose sum is σ = 1391890080. Its totient is φ = 255314400.

The previous prime is 639854899. The next prime is 639854903. The reversal of 639854900 is 9458936.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639854903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34265 + ... + 49535.

Almost surely, 2^639854900 is an apocalyptic number.

It is an amenable number.

639854900 is an abundant number, since it is smaller than the sum of its proper divisors (752035180).

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

639854900 is a wasteful number, since it uses less digits than its factorization.

639854900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15704 (or 15697 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 639854900 is about 25295.3533282301. The cubic root of 639854900 is about 861.7087443250.

The spelling of 639854900 in words is "six hundred thirty-nine million, eight hundred fifty-four thousand, nine hundred".