638559 has 6 divisors (see below), whose sum is σ = 922376. Its totient is φ = 425700.

The previous prime is 638527. The next prime is 638567. The reversal of 638559 is 955836.

It is not a de Polignac number, because 638559 - 2⁵ = 638527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638059) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35467 + ... + 35484.

2⁶³⁸⁵⁵⁹ is an apocalyptic number.

638559 is a deficient number, since it is larger than the sum of its proper divisors (283817).

638559 is a wasteful number, since it uses less digits than its factorization.

638559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70957 (or 70954 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 638559 is about 799.0988674751. The cubic root of 638559 is about 86.1126610736.

The spelling of 638559 in words is "six hundred thirty-eight thousand, five hundred fifty-nine".