12189442 has 12 divisors (see below), whose sum is σ = 19423890. Its totient is φ = 5735936.

The previous prime is 12189439. The next prime is 12189449. The reversal of 12189442 is 24498121.

It can be written as a sum of positive squares in 3 ways, for example, as 11498881 + 690561 = 3391^2 + 831^2 .

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 5 ways as a sum of consecutive naturals, for example, 9967 + ... + 11122.

Almost surely, 2^12189442 is an apocalyptic number.

12189442 is a deficient number, since it is larger than the sum of its proper divisors (7234448).

12189442 is a wasteful number, since it uses less digits than its factorization.

12189442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21125 (or 21108 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 12189442 is about 3491.3381388803. The cubic root of 12189442 is about 230.1413246128.

The spelling of 12189442 in words is "twelve million, one hundred eighty-nine thousand, four hundred forty-two".