12078189 has 12 divisors (see below), whose sum is σ = 18009472. Its totient is φ = 7792200.

The previous prime is 12078173. The next prime is 12078193. The reversal of 12078189 is 98187021.

12078189 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12078189 - 2⁴ = 12078173 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 (12078139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21367 + ... + 21924.

Almost surely, 2^12078189 is an apocalyptic number.

It is an amenable number.

12078189 is a deficient number, since it is larger than the sum of its proper divisors (5931283).

12078189 is a wasteful number, since it uses less digits than its factorization.

12078189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43328 (or 43325 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 12078189 is about 3475.3689012823. The cubic root of 12078189 is about 229.4390172173.

The spelling of 12078189 in words is "twelve million, seventy-eight thousand, one hundred eighty-nine".