13638911 has 16 divisors (see below), whose sum is σ = 16171008. Its totient is φ = 11340000.

The previous prime is 13638907. The next prime is 13638943. The reversal of 13638911 is 11983631.

It is a cyclic number.

It is not a de Polignac number, because 13638911 - 2² = 13638907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17786 + ... + 18536.

It is an arithmetic number, because the mean of its divisors is an integer number (1010688).

Almost surely, 2^13638911 is an apocalyptic number.

13638911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13638911 is a deficient number, since it is larger than the sum of its proper divisors (2532097).

13638911 is a wasteful number, since it uses less digits than its factorization.

13638911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 902.

The product of its digits is 3888, while the sum is 32.

The square root of 13638911 is about 3693.0896279403. The cubic root of 13638911 is about 238.9240668425.

The spelling of 13638911 in words is "thirteen million, six hundred thirty-eight thousand, nine hundred eleven".