12686906 has 4 divisors (see below), whose sum is σ = 19030362. Its totient is φ = 6343452.

The previous prime is 12686897. The next prime is 12686909. The reversal of 12686906 is 60968621.

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

It can be written as a sum of positive squares in only one way, i.e., 12538681 + 148225 = 3541^2 + 385^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12686906.

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 as a sum of consecutive naturals, namely, 3171725 + ... + 3171728.

Almost surely, 2^12686906 is an apocalyptic number.

12686906 is a deficient number, since it is larger than the sum of its proper divisors (6343456).

12686906 is an equidigital number, since it uses as much as digits as its factorization.

12686906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6343455.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 12686906 is about 3561.8683299639. The cubic root of 12686906 is about 233.2304448874.

The spelling of 12686906 in words is "twelve million, six hundred eighty-six thousand, nine hundred six".