12686 has 4 divisors (see below), whose sum is σ = 19032. Its totient is φ = 6342.

The previous prime is 12671. The next prime is 12689. The reversal of 12686 is 68621.

12686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68621 = 7 ⋅9803.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3170 + ... + 3173.

It is an arithmetic number, because the mean of its divisors is an integer number (4758).

2¹²⁶⁸⁶ is an apocalyptic number.

12686 is a deficient number, since it is larger than the sum of its proper divisors (6346).

12686 is an equidigital number, since it uses as much as digits as its factorization.

12686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345.

The product of its digits is 576, while the sum is 23.

The square root of 12686 is about 112.6321446125. The cubic root of 12686 is about 23.3224892921.

It can be divided in two parts, 126 and 86, that added together give a palindrome (212).

The spelling of 12686 in words is "twelve thousand, six hundred eighty-six".