12189447 has 20 divisors (see below), whose sum is σ = 18514936. Its totient is φ = 7989840.

The previous prime is 12189439. The next prime is 12189449. The reversal of 12189447 is 74498121.

12189447 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12189447 - 2³ = 12189439 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 (12189449) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3708 + ... + 6174.

Almost surely, 2^12189447 is an apocalyptic number.

12189447 is a deficient number, since it is larger than the sum of its proper divisors (6325489).

12189447 is an equidigital number, since it uses as much as digits as its factorization.

12189447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540 (or 2531 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12189447 is about 3491.3388549380. The cubic root of 12189447 is about 230.1413560801.

The spelling of 12189447 in words is "twelve million, one hundred eighty-nine thousand, four hundred forty-seven".