638512 has 20 divisors (see below), whose sum is σ = 1414096. Its totient is φ = 273600.

The previous prime is 638501. The next prime is 638527. The reversal of 638512 is 215836.

It is a happy number.

638512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

638512 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2739 + ... + 2962.

2⁶³⁸⁵¹² is an apocalyptic number.

It is an amenable number.

638512 is an abundant number, since it is smaller than the sum of its proper divisors (775584).

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

638512 is a wasteful number, since it uses less digits than its factorization.

638512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5716 (or 5710 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 638512 is about 799.0694588082. The cubic root of 638512 is about 86.1105482986.

The spelling of 638512 in words is "six hundred thirty-eight thousand, five hundred twelve".