12866 has 8 divisors (see below), whose sum is σ = 22080. Its totient is φ = 5508.

The previous prime is 12853. The next prime is 12889. The reversal of 12866 is 66821.

12866 = 14² + 15² + ... + 34².

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

It is a Curzon number.

It is a nialpdrome in base 12.

It is an unprimeable number.

12866 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 446 + ... + 473.

It is an arithmetic number, because the mean of its divisors is an integer number (2760).

2¹²⁸⁶⁶ is an apocalyptic number.

12866 is a deficient number, since it is larger than the sum of its proper divisors (9214).

12866 is an equidigital number, since it uses as much as digits as its factorization.

12866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928.

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

The square root of 12866 is about 113.4283915076. The cubic root of 12866 is about 23.4322782441.

It can be divided in two parts, 128 and 66, that multiplied together give a palindrome (8448).

The spelling of 12866 in words is "twelve thousand, eight hundred sixty-six".