12189689 has 4 divisors (see below), whose sum is σ = 12207780. Its totient is φ = 12171600.

The previous prime is 12189677. The next prime is 12189703. The reversal of 12189689 is 98698121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9241600 + 2948089 = 3040^2 + 1717^2 .

It is a cyclic number.

It is not a de Polignac number, because 12189689 - 2¹⁶ = 12124153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12185689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7994 + ... + 9395.

It is an arithmetic number, because the mean of its divisors is an integer number (3051945).

Almost surely, 2^12189689 is an apocalyptic number.

It is an amenable number.

12189689 is a deficient number, since it is larger than the sum of its proper divisors (18091).

12189689 is an equidigital number, since it uses as much as digits as its factorization.

12189689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18090.

The product of its digits is 62208, while the sum is 44.

The square root of 12189689 is about 3491.3735119577. The cubic root of 12189689 is about 230.1428790871.

The spelling of 12189689 in words is "twelve million, one hundred eighty-nine thousand, six hundred eighty-nine".