13638975 has 48 divisors (see below), whose sum is σ = 26164992. Its totient is φ = 6140160.

The previous prime is 13638943. The next prime is 13638991. The reversal of 13638975 is 57983631.

It is not a de Polignac number, because 13638975 - 2⁵ = 13638943 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43419 + ... + 43731.

It is an arithmetic number, because the mean of its divisors is an integer number (545104).

Almost surely, 2^13638975 is an apocalyptic number.

13638975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13638975 is a deficient number, since it is larger than the sum of its proper divisors (12526017).

13638975 is a wasteful number, since it uses less digits than its factorization.

13638975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 411 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 13638975 is about 3693.0982927618. The cubic root of 13638975 is about 238.9244405555.

The spelling of 13638975 in words is "thirteen million, six hundred thirty-eight thousand, nine hundred seventy-five".