12691906 has 8 divisors (see below), whose sum is σ = 19865664. Its totient is φ = 6070020.

The previous prime is 12691891. The next prime is 12691907. The reversal of 12691906 is 60919621.

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

It is a super-2 number, since 2×12691906² = 322168955825672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12691907) 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, 137910 + ... + 138001.

It is an arithmetic number, because the mean of its divisors is an integer number (2483208).

Almost surely, 2^12691906 is an apocalyptic number.

12691906 is a deficient number, since it is larger than the sum of its proper divisors (7173758).

12691906 is a wasteful number, since it uses less digits than its factorization.

12691906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275936.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 12691906 is about 3562.5701396604. The cubic root of 12691906 is about 233.2610801230.

The spelling of 12691906 in words is "twelve million, six hundred ninety-one thousand, nine hundred six".