12656861 has 8 divisors (see below), whose sum is σ = 14500800. Its totient is φ = 10821888.

The previous prime is 12656843. The next prime is 12656867. The reversal of 12656861 is 16865621.

It is a happy number.

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

It is not a de Polignac number, because 12656861 - 2⁶ = 12656797 is a prime.

It is a super-2 number, since 2×12656861² = 320392260746642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12656867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1130 + ... + 5156.

It is an arithmetic number, because the mean of its divisors is an integer number (1812600).

Almost surely, 2^12656861 is an apocalyptic number.

It is an amenable number.

12656861 is a deficient number, since it is larger than the sum of its proper divisors (1843939).

12656861 is an equidigital number, since it uses as much as digits as its factorization.

12656861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4483.

The product of its digits is 17280, while the sum is 35.

The square root of 12656861 is about 3557.6482400597. The cubic root of 12656861 is about 233.0461880473.

The spelling of 12656861 in words is "twelve million, six hundred fifty-six thousand, eight hundred sixty-one".