13638980 has 12 divisors (see below), whose sum is σ = 28641900. Its totient is φ = 5455584.

The previous prime is 13638943. The next prime is 13638991. The reversal of 13638980 is 8983631.

It can be written as a sum of positive squares in 2 ways, for example, as 5607424 + 8031556 = 2368^2 + 2834^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340955 + ... + 340994.

It is an arithmetic number, because the mean of its divisors is an integer number (2386825).

Almost surely, 2^13638980 is an apocalyptic number.

13638980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13638980 is an abundant number, since it is smaller than the sum of its proper divisors (15002920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13638980 is a wasteful number, since it uses less digits than its factorization.

13638980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681958 (or 681956 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 13638980 is about 3693.0989697001. The cubic root of 13638980 is about 238.9244697518.

The spelling of 13638980 in words is "thirteen million, six hundred thirty-eight thousand, nine hundred eighty".