12387189 has 4 divisors (see below), whose sum is σ = 16516256. Its totient is φ = 8258124.

The previous prime is 12387149. The next prime is 12387217. The reversal of 12387189 is 98178321.

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.

It is not a de Polignac number, because 12387189 - 2⁷ = 12387061 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 (12387149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2064529 + ... + 2064534.

It is an arithmetic number, because the mean of its divisors is an integer number (4129064).

Almost surely, 2^12387189 is an apocalyptic number.

It is an amenable number.

12387189 is a deficient number, since it is larger than the sum of its proper divisors (4129067).

12387189 is an equidigital number, since it uses as much as digits as its factorization.

12387189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4129066.

The product of its digits is 24192, while the sum is 39.

The square root of 12387189 is about 3519.5438624913. The cubic root of 12387189 is about 231.3791677700.

The spelling of 12387189 in words is "twelve million, three hundred eighty-seven thousand, one hundred eighty-nine".