12189815 has 16 divisors (see below), whose sum is σ = 16039296. Its totient is φ = 8820000.

The previous prime is 12189809. The next prime is 12189817. The reversal of 12189815 is 51898121.

It is not a de Polignac number, because 12189815 - 2⁸ = 12189559 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 (12189817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13364 + ... + 14246.

It is an arithmetic number, because the mean of its divisors is an integer number (1002456).

Almost surely, 2^12189815 is an apocalyptic number.

12189815 is a deficient number, since it is larger than the sum of its proper divisors (3849481).

12189815 is a wasteful number, since it uses less digits than its factorization.

12189815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150.

The product of its digits is 5760, while the sum is 35.

The square root of 12189815 is about 3491.3915563855. The cubic root of 12189815 is about 230.1436720497.

The spelling of 12189815 in words is "twelve million, one hundred eighty-nine thousand, eight hundred fifteen".