12990187 has 4 divisors (see below), whose sum is σ = 14845936. Its totient is φ = 11134440.

The previous prime is 12990181. The next prime is 12990191. The reversal of 12990187 is 78109921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12990187 - 2³ = 12990179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12990181) 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, 927864 + ... + 927877.

It is an arithmetic number, because the mean of its divisors is an integer number (3711484).

Almost surely, 2^12990187 is an apocalyptic number.

12990187 is a deficient number, since it is larger than the sum of its proper divisors (1855749).

12990187 is an equidigital number, since it uses as much as digits as its factorization.

12990187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855748.

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

The square root of 12990187 is about 3604.1902003085. The cubic root of 12990187 is about 235.0742906813.

The spelling of 12990187 in words is "twelve million, nine hundred ninety thousand, one hundred eighty-seven".