13638944 has 24 divisors (see below), whose sum is σ = 29293488. Its totient is φ = 6199360.

The previous prime is 13638943. The next prime is 13638991. The reversal of 13638944 is 44983631.

It is a junction number, because it is equal to n+sod(n) for n = 13638898 and 13638907.

It is not an unprimeable number, because it can be changed into a prime (13638943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19022 + ... + 19725.

It is an arithmetic number, because the mean of its divisors is an integer number (1220562).

Almost surely, 2^13638944 is an apocalyptic number.

It is an amenable number.

13638944 is an abundant number, since it is smaller than the sum of its proper divisors (15654544).

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

13638944 is a wasteful number, since it uses less digits than its factorization.

13638944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38768 (or 38760 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 13638944 is about 3693.0940957414. The cubic root of 13638944 is about 238.9242595384.

The spelling of 13638944 in words is "thirteen million, six hundred thirty-eight thousand, nine hundred forty-four".