638896 has 20 divisors (see below), whose sum is σ = 1257112. Its totient is φ = 314496.

The previous prime is 638893. The next prime is 638923. The reversal of 638896 is 698836.

It is not an unprimeable number, because it can be changed into a prime (638893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895 + ... + 1441.

2⁶³⁸⁸⁹⁶ is an apocalyptic number.

It is an amenable number.

638896 is a deficient number, since it is larger than the sum of its proper divisors (618216).

638896 is a wasteful number, since it uses less digits than its factorization.

638896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 628 (or 622 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 638896 is about 799.3097021806. The cubic root of 638896 is about 86.1278070837.

The spelling of 638896 in words is "six hundred thirty-eight thousand, eight hundred ninety-six".