12661986 has 16 divisors (see below), whose sum is σ = 25416864. Its totient is φ = 4205184.

The previous prime is 12661973. The next prime is 12661997. The reversal of 12661986 is 68916621.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2031 + ... + 5426.

It is an arithmetic number, because the mean of its divisors is an integer number (1588554).

Almost surely, 2^12661986 is an apocalyptic number.

12661986 is an abundant number, since it is smaller than the sum of its proper divisors (12754878).

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

12661986 is a wasteful number, since it uses less digits than its factorization.

12661986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7745.

The product of its digits is 31104, while the sum is 39.

The square root of 12661986 is about 3558.3684463529. The cubic root of 12661986 is about 233.0776387244.

The spelling of 12661986 in words is "twelve million, six hundred sixty-one thousand, nine hundred eighty-six".