638517 has 12 divisors (see below), whose sum is σ = 936320. Its totient is φ = 386760.

The previous prime is 638501. The next prime is 638527. The reversal of 638517 is 715836.

It is not a de Polignac number, because 638517 - 2⁴ = 638501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 517 + ... + 1242.

2⁶³⁸⁵¹⁷ is an apocalyptic number.

It is an amenable number.

638517 is a deficient number, since it is larger than the sum of its proper divisors (297803).

638517 is a wasteful number, since it uses less digits than its factorization.

638517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784 (or 1773 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 638517 is about 799.0725874412. The cubic root of 638517 is about 86.1107730669.

The spelling of 638517 in words is "six hundred thirty-eight thousand, five hundred seventeen".