12918986 has 4 divisors (see below), whose sum is σ = 19378482. Its totient is φ = 6459492.

The previous prime is 12918979. The next prime is 12918991. The reversal of 12918986 is 68981921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68981921 = 2753 ⋅25057.

It can be written as a sum of positive squares in only one way, i.e., 10725625 + 2193361 = 3275^2 + 1481^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3229745 + ... + 3229748.

Almost surely, 2^12918986 is an apocalyptic number.

12918986 is a deficient number, since it is larger than the sum of its proper divisors (6459496).

12918986 is an equidigital number, since it uses as much as digits as its factorization.

12918986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6459495.

The product of its digits is 62208, while the sum is 44.

The square root of 12918986 is about 3594.2990971815. The cubic root of 12918986 is about 234.6440120857.

The spelling of 12918986 in words is "twelve million, nine hundred eighteen thousand, nine hundred eighty-six".