12187990 has 16 divisors (see below), whose sum is σ = 22153248. Its totient is φ = 4827456.

The previous prime is 12187951. The next prime is 12188003. The reversal of 12187990 is 9978121.

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, 4887 + ... + 6946.

It is an arithmetic number, because the mean of its divisors is an integer number (1384578).

Almost surely, 2^12187990 is an apocalyptic number.

12187990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12187990 is a deficient number, since it is larger than the sum of its proper divisors (9965258).

12187990 is a wasteful number, since it uses less digits than its factorization.

12187990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11943.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 12187990 is about 3491.1301894945. The cubic root of 12187990 is about 230.1321861449.

The spelling of 12187990 in words is "twelve million, one hundred eighty-seven thousand, nine hundred ninety".