12156189 has 4 divisors (see below), whose sum is σ = 16208256. Its totient is φ = 8104124.

The previous prime is 12156187. The next prime is 12156197. The reversal of 12156189 is 98165121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98165121 = 3 ⋅32721707.

It is a cyclic number.

It is not a de Polignac number, because 12156189 - 2¹ = 12156187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026029 + ... + 2026034.

It is an arithmetic number, because the mean of its divisors is an integer number (4052064).

Almost surely, 2^12156189 is an apocalyptic number.

It is an amenable number.

12156189 is a deficient number, since it is larger than the sum of its proper divisors (4052067).

12156189 is an equidigital number, since it uses as much as digits as its factorization.

12156189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052066.

The product of its digits is 4320, while the sum is 33.

The square root of 12156189 is about 3486.5726724105. The cubic root of 12156189 is about 229.9318575701.

The spelling of 12156189 in words is "twelve million, one hundred fifty-six thousand, one hundred eighty-nine".