12686905 has 32 divisors (see below), whose sum is σ = 19611648. Its totient is φ = 7646400.

The previous prime is 12686897. The next prime is 12686909. The reversal of 12686905 is 50968621.

It is not a de Polignac number, because 12686905 - 2³ = 12686897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12686909) 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 31 ways as a sum of consecutive naturals, for example, 11404 + ... + 12466.

It is an arithmetic number, because the mean of its divisors is an integer number (612864).

Almost surely, 2^12686905 is an apocalyptic number.

It is an amenable number.

12686905 is a deficient number, since it is larger than the sum of its proper divisors (6924743).

12686905 is a wasteful number, since it uses less digits than its factorization.

12686905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 12686905 is about 3561.8681895882. The cubic root of 12686905 is about 233.2304387595.

The spelling of 12686905 in words is "twelve million, six hundred eighty-six thousand, nine hundred five".