12684661 has 16 divisors (see below), whose sum is σ = 14571648. Its totient is φ = 10929600.

The previous prime is 12684653. The next prime is 12684667. The reversal of 12684661 is 16648621.

12684661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12684661 - 2³ = 12684653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12684667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45655 + ... + 45931.

It is an arithmetic number, because the mean of its divisors is an integer number (910728).

Almost surely, 2^12684661 is an apocalyptic number.

12684661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12684661 is a deficient number, since it is larger than the sum of its proper divisors (1886987).

12684661 is a wasteful number, since it uses less digits than its factorization.

12684661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its digits is 13824, while the sum is 34.

The square root of 12684661 is about 3561.5531724235. The cubic root of 12684661 is about 233.2166870482.

It can be divided in two parts, 1268 and 4661, that added together give a square (5929 = 77²).

The spelling of 12684661 in words is "twelve million, six hundred eighty-four thousand, six hundred sixty-one".