12691986 has 8 divisors (see below), whose sum is σ = 25383984. Its totient is φ = 4230660.

The previous prime is 12691957. The next prime is 12691997. The reversal of 12691986 is 68919621.

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

12691986 is an admirable number.

It is a super-2 number, since 2×12691986² = 322173017248392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057660 + ... + 1057671.

It is an arithmetic number, because the mean of its divisors is an integer number (3172998).

Almost surely, 2^12691986 is an apocalyptic number.

12691986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12691986 is a wasteful number, since it uses less digits than its factorization.

12691986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115336.

The product of its digits is 46656, while the sum is 42.

The square root of 12691986 is about 3562.5813674918. The cubic root of 12691986 is about 233.2615702213.

The spelling of 12691986 in words is "twelve million, six hundred ninety-one thousand, nine hundred eighty-six".