638339400 has 96 divisors (see below), whose sum is σ = 2198743200. Its totient is φ = 170222400.

The previous prime is 638339369. The next prime is 638339419. The reversal of 638339400 is 4933836.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53706 + ... + 64505.

It is an arithmetic number, because the mean of its divisors is an integer number (22903575).

Almost surely, 2^638339400 is an apocalyptic number.

638339400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638339400 is an abundant number, since it is smaller than the sum of its proper divisors (1560403800).

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

638339400 is a wasteful number, since it uses less digits than its factorization.

638339400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118236 (or 118221 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 638339400 is about 25265.3794746883. The cubic root of 638339400 is about 861.0278858018.

The spelling of 638339400 in words is "six hundred thirty-eight million, three hundred thirty-nine thousand, four hundred".