12691679 has 32 divisors (see below), whose sum is σ = 17633280. Its totient is φ = 8812800.

The previous prime is 12691649. The next prime is 12691691. The reversal of 12691679 is 97619621.

It is a cyclic number.

It is not a de Polignac number, because 12691679 - 2¹² = 12687583 is a prime.

It is a super-2 number, since 2×12691679² = 322157431678082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30827 + ... + 31235.

It is an arithmetic number, because the mean of its divisors is an integer number (551040).

Almost surely, 2^12691679 is an apocalyptic number.

12691679 is a deficient number, since it is larger than the sum of its proper divisors (4941601).

12691679 is a wasteful number, since it uses less digits than its factorization.

12691679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471.

The product of its digits is 40824, while the sum is 41.

The square root of 12691679 is about 3562.5382804961. The cubic root of 12691679 is about 233.2596894576.

The spelling of 12691679 in words is "twelve million, six hundred ninety-one thousand, six hundred seventy-nine".