638832 has 20 divisors (see below), whose sum is σ = 1650440. Its totient is φ = 212928.

The previous prime is 638819. The next prime is 638839. The reversal of 638832 is 238836.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 638832.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638832.

It is not an unprimeable number, because it can be changed into a prime (638839) by changing a digit.

638832 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, 6607 + ... + 6702.

It is an arithmetic number, because the mean of its divisors is an integer number (82522).

2⁶³⁸⁸³² is an apocalyptic number.

It is an amenable number.

638832 is an abundant number, since it is smaller than the sum of its proper divisors (1011608).

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

638832 is a wasteful number, since it uses less digits than its factorization.

638832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13320 (or 13314 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 638832 is about 799.2696666332. The cubic root of 638832 is about 86.1249310998.

The spelling of 638832 in words is "six hundred thirty-eight thousand, eight hundred thirty-two".