12189894 has 16 divisors (see below), whose sum is σ = 24840432. Its totient is φ = 3986528.

The previous prime is 12189871. The next prime is 12189907. The reversal of 12189894 is 49898121.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18849 + ... + 19484.

It is an arithmetic number, because the mean of its divisors is an integer number (1552527).

Almost surely, 2^12189894 is an apocalyptic number.

12189894 is an abundant number, since it is smaller than the sum of its proper divisors (12650538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12189894 is a wasteful number, since it uses less digits than its factorization.

12189894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38391.

The product of its digits is 41472, while the sum is 42.

The square root of 12189894 is about 3491.4028699077. The cubic root of 12189894 is about 230.1441692219.

The spelling of 12189894 in words is "twelve million, one hundred eighty-nine thousand, eight hundred ninety-four".