638532 has 18 divisors (see below), whose sum is σ = 1614158. Its totient is φ = 212832.

The previous prime is 638527. The next prime is 638567. The reversal of 638532 is 235836.

638532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 617796 + 20736 = 786^2 + 144^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 638496 and 638505.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8833 + ... + 8904.

2⁶³⁸⁵³² is an apocalyptic number.

It is an amenable number.

638532 is an abundant number, since it is smaller than the sum of its proper divisors (975626).

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

638532 is a wasteful number, since it uses less digits than its factorization.

638532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17747 (or 17742 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 638532 is about 799.0819732668. The cubic root of 638532 is about 86.1114473645. Note that the first 3 decimals are identical.

The spelling of 638532 in words is "six hundred thirty-eight thousand, five hundred thirty-two".