12991186 has 8 divisors (see below), whose sum is σ = 20985804. Its totient is φ = 5995920.

The previous prime is 12991177. The next prime is 12991189. The reversal of 12991186 is 68119921.

12991186 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12709225 + 281961 = 3565^2 + 531^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12991189) 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, 249805 + ... + 249856.

Almost surely, 2^12991186 is an apocalyptic number.

12991186 is a deficient number, since it is larger than the sum of its proper divisors (7994618).

12991186 is a wasteful number, since it uses less digits than its factorization.

12991186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499676.

The product of its digits is 7776, while the sum is 37.

The square root of 12991186 is about 3604.3287863346. The cubic root of 12991186 is about 235.0803165939.

It can be divided in two parts, 1299 and 1186, that added together give a triangular number (2485 = T₇₀).

The spelling of 12991186 in words is "twelve million, nine hundred ninety-one thousand, one hundred eighty-six".