13638917 has 4 divisors (see below), whose sum is σ = 13691040. Its totient is φ = 13586796.

The previous prime is 13638907. The next prime is 13638943. The reversal of 13638917 is 71983631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71983631 = 229 ⋅314339.

It is a cyclic number.

It is not a de Polignac number, because 13638917 - 2⁸ = 13638661 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 (13638907) 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, 25667 + ... + 26192.

It is an arithmetic number, because the mean of its divisors is an integer number (3422760).

Almost surely, 2^13638917 is an apocalyptic number.

It is an amenable number.

13638917 is a deficient number, since it is larger than the sum of its proper divisors (52123).

13638917 is an equidigital number, since it uses as much as digits as its factorization.

13638917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52122.

The product of its digits is 27216, while the sum is 38.

The square root of 13638917 is about 3693.0904402682. The cubic root of 13638917 is about 238.9241018781.

The spelling of 13638917 in words is "thirteen million, six hundred thirty-eight thousand, nine hundred seventeen".