13815389 has 4 divisors (see below), whose sum is σ = 15789024. Its totient is φ = 11841756.

The previous prime is 13815383. The next prime is 13815421. The reversal of 13815389 is 98351831.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13815389 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 (13815383) 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, 986807 + ... + 986820.

It is an arithmetic number, because the mean of its divisors is an integer number (3947256).

Almost surely, 2^13815389 is an apocalyptic number.

It is an amenable number.

13815389 is a deficient number, since it is larger than the sum of its proper divisors (1973635).

13815389 is an equidigital number, since it uses as much as digits as its factorization.

13815389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973634.

The product of its digits is 25920, while the sum is 38.

The square root of 13815389 is about 3716.9058368487. The cubic root of 13815389 is about 239.9501574736.

The spelling of 13815389 in words is "thirteen million, eight hundred fifteen thousand, three hundred eighty-nine".