12686621 has 4 divisors (see below), whose sum is σ = 12699744. Its totient is φ = 12673500.

The previous prime is 12686599. The next prime is 12686627. The reversal of 12686621 is 12668621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12686621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12686627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4985 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (3174936).

Almost surely, 2^12686621 is an apocalyptic number.

It is an amenable number.

12686621 is a deficient number, since it is larger than the sum of its proper divisors (13123).

12686621 is a wasteful number, since it uses less digits than its factorization.

12686621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13122.

The product of its digits is 6912, while the sum is 32.

The square root of 12686621 is about 3561.8283226455. The cubic root of 12686621 is about 233.2286984365.

The spelling of 12686621 in words is "twelve million, six hundred eighty-six thousand, six hundred twenty-one".