12185986 has 4 divisors (see below), whose sum is σ = 18278982. Its totient is φ = 6092992.

The previous prime is 12185981. The next prime is 12186001. The reversal of 12185986 is 68958121.

12185986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 10791225 + 1394761 = 3285^2 + 1181^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12185981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3046495 + ... + 3046498.

Almost surely, 2^12185986 is an apocalyptic number.

12185986 is a deficient number, since it is larger than the sum of its proper divisors (6092996).

12185986 is an equidigital number, since it uses as much as digits as its factorization.

12185986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6092995.

The product of its digits is 34560, while the sum is 40.

The square root of 12185986 is about 3490.8431646237. The cubic root of 12185986 is about 230.1195723565.

The spelling of 12185986 in words is "twelve million, one hundred eighty-five thousand, nine hundred eighty-six".