13989815 has 16 divisors (see below), whose sum is σ = 19656000. Its totient is φ = 9358080.

The previous prime is 13989791. The next prime is 13989817. The reversal of 13989815 is 51898931.

It is a happy number.

It is not a de Polignac number, because 13989815 - 2¹⁴ = 13973431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13989817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3440 + ... + 6309.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^13989815 is an apocalyptic number.

13989815 is a deficient number, since it is larger than the sum of its proper divisors (5666185).

13989815 is an equidigital number, since it uses as much as digits as its factorization.

13989815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9802.

The product of its digits is 77760, while the sum is 44.

The square root of 13989815 is about 3740.2961112725. The cubic root of 13989815 is about 240.9557662887.

The spelling of 13989815 in words is "thirteen million, nine hundred eighty-nine thousand, eight hundred fifteen".