638984525 has 24 divisors (see below), whose sum is σ = 841374720. Its totient is φ = 479727360.

The previous prime is 638984513. The next prime is 638984527. The reversal of 638984525 is 525489836.

It is not a de Polignac number, because 638984525 - 2⁴ = 638984509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638984527) 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, 159092 + ... + 163058.

It is an arithmetic number, because the mean of its divisors is an integer number (35057280).

Almost surely, 2^638984525 is an apocalyptic number.

It is an amenable number.

638984525 is a deficient number, since it is larger than the sum of its proper divisors (202390195).

638984525 is a wasteful number, since it uses less digits than its factorization.

638984525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373 (or 4368 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The square root of 638984525 is about 25278.1432269065. The cubic root of 638984525 is about 861.3178483696.

The spelling of 638984525 in words is "six hundred thirty-eight million, nine hundred eighty-four thousand, five hundred twenty-five".