12189609 has 28 divisors (see below), whose sum is σ = 19096896. Its totient is φ = 7762392.

The previous prime is 12189607. The next prime is 12189623. The reversal of 12189609 is 90698121.

It is not a de Polignac number, because 12189609 - 2¹ = 12189607 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12189607) 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 27 ways as a sum of consecutive naturals, for example, 16404 + ... + 17130.

It is an arithmetic number, because the mean of its divisors is an integer number (682032).

Almost surely, 2^12189609 is an apocalyptic number.

It is an amenable number.

12189609 is a deficient number, since it is larger than the sum of its proper divisors (6907287).

12189609 is an frugal number, since it uses more digits than its factorization.

12189609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 12189609 is about 3491.3620551298. The cubic root of 12189609 is about 230.1423756159.

The spelling of 12189609 in words is "twelve million, one hundred eighty-nine thousand, six hundred nine".