13638389 has 4 divisors (see below), whose sum is σ = 13720224. Its totient is φ = 13556556.

The previous prime is 13638377. The next prime is 13638397. The reversal of 13638389 is 98383631.

13638389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 98383631 = 29 ⋅3392539.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13638389 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 (13638329) 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, 40667 + ... + 41000.

It is an arithmetic number, because the mean of its divisors is an integer number (3430056).

Almost surely, 2^13638389 is an apocalyptic number.

It is an amenable number.

13638389 is a deficient number, since it is larger than the sum of its proper divisors (81835).

13638389 is an equidigital number, since it uses as much as digits as its factorization.

13638389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81834.

The product of its digits is 93312, while the sum is 41.

The square root of 13638389 is about 3693.0189547307. The cubic root of 13638389 is about 238.9210187019.

The spelling of 13638389 in words is "thirteen million, six hundred thirty-eight thousand, three hundred eighty-nine".