13638244 has 12 divisors (see below), whose sum is σ = 24169600. Its totient is φ = 6732648.

The previous prime is 13638239. The next prime is 13638253. The reversal of 13638244 is 44283631.

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, 21264 + ... + 21895.

Almost surely, 2^13638244 is an apocalyptic number.

It is an amenable number.

13638244 is a deficient number, since it is larger than the sum of its proper divisors (10531356).

13638244 is a wasteful number, since it uses less digits than its factorization.

13638244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43242 (or 43240 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 13638244 is about 3692.9993230435. Note that the first 3 decimals coincide. The cubic root of 13638244 is about 238.9201719824.

The spelling of 13638244 in words is "thirteen million, six hundred thirty-eight thousand, two hundred forty-four".