12886691 has 4 divisors (see below), whose sum is σ = 13014384. Its totient is φ = 12759000.

The previous prime is 12886667. The next prime is 12886711. The reversal of 12886691 is 19668821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12886691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12886651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63695 + ... + 63896.

It is an arithmetic number, because the mean of its divisors is an integer number (3253596).

Almost surely, 2^12886691 is an apocalyptic number.

12886691 is a deficient number, since it is larger than the sum of its proper divisors (127693).

12886691 is a wasteful number, since it uses less digits than its factorization.

12886691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127692.

The product of its digits is 41472, while the sum is 41.

The square root of 12886691 is about 3589.8037550819. The cubic root of 12886691 is about 234.4483271837.

The spelling of 12886691 in words is "twelve million, eight hundred eighty-six thousand, six hundred ninety-one".