13638840 has 32 divisors (see below), whose sum is σ = 40916880. Its totient is φ = 3636992.

The previous prime is 13638817. The next prime is 13638881. The reversal of 13638840 is 4883631.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56709 + ... + 56948.

Almost surely, 2^13638840 is an apocalyptic number.

13638840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13638840 is an abundant number, since it is smaller than the sum of its proper divisors (27278040).

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

13638840 is a wasteful number, since it uses less digits than its factorization.

13638840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113671 (or 113667 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 13638840 is about 3693.0800153801. The cubic root of 13638840 is about 238.9236522532.

The spelling of 13638840 in words is "thirteen million, six hundred thirty-eight thousand, eight hundred forty".