638380 has 24 divisors (see below), whose sum is σ = 1365840. Its totient is φ = 250560.

The previous prime is 638371. The next prime is 638423. The reversal of 638380 is 83836.

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, 910 + ... + 1450.

It is an arithmetic number, because the mean of its divisors is an integer number (56910).

2⁶³⁸³⁸⁰ is an apocalyptic number.

It is an amenable number.

638380 is an abundant number, since it is smaller than the sum of its proper divisors (727460).

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

638380 is a wasteful number, since it uses less digits than its factorization.

638380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609 (or 607 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 638380 is about 798.9868584651. The cubic root of 638380 is about 86.1046139932.

The spelling of 638380 in words is "six hundred thirty-eight thousand, three hundred eighty".