638507 has 8 divisors (see below), whose sum is σ = 675840. Its totient is φ = 602280.

The previous prime is 638501. The next prime is 638527. The reversal of 638507 is 705836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 638507 - 2¹⁴ = 622123 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 638507.

It is not an unprimeable number, because it can be changed into a prime (638501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094 + ... + 1572.

It is an arithmetic number, because the mean of its divisors is an integer number (84480).

2⁶³⁸⁵⁰⁷ is an apocalyptic number.

638507 is a deficient number, since it is larger than the sum of its proper divisors (37333).

638507 is a wasteful number, since it uses less digits than its factorization.

638507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 638507 is about 799.0663301629. The cubic root of 638507 is about 86.1103235292.

The spelling of 638507 in words is "six hundred thirty-eight thousand, five hundred seven".