12561684 has 12 divisors (see below), whose sum is σ = 29310624. Its totient is φ = 4187224.

The previous prime is 12561671. The next prime is 12561701. The reversal of 12561684 is 48616521.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523392 + ... + 523415.

It is an arithmetic number, because the mean of its divisors is an integer number (2442552).

Almost surely, 2^12561684 is an apocalyptic number.

It is an amenable number.

12561684 is an abundant number, since it is smaller than the sum of its proper divisors (16748940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12561684 is a wasteful number, since it uses less digits than its factorization.

12561684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046814 (or 1046812 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 12561684 is about 3544.2466054156. The cubic root of 12561684 is about 232.4605644758.

The spelling of 12561684 in words is "twelve million, five hundred sixty-one thousand, six hundred eighty-four".