638937 has 24 divisors (see below), whose sum is σ = 1025024. Its totient is φ = 381024.

The previous prime is 638933. The next prime is 638959. The reversal of 638937 is 739836.

638937 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 638937 - 2² = 638933 is a prime.

Its product of digits (27216) is a multiple of the sum of its prime factors (189).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638937.

It is not an unprimeable number, because it can be changed into a prime (638933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4968 + ... + 5094.

2⁶³⁸⁹³⁷ is an apocalyptic number.

It is an amenable number.

638937 is a deficient number, since it is larger than the sum of its proper divisors (386087).

638937 is a wasteful number, since it uses less digits than its factorization.

638937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 186 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 638937 is about 799.3353488993. The cubic root of 638937 is about 86.1296494099.

The spelling of 638937 in words is "six hundred thirty-eight thousand, nine hundred thirty-seven".