12656443 has 2 divisors, whose sum is σ = 12656444. Its totient is φ = 12656442.

The previous prime is 12656437. The next prime is 12656467. The reversal of 12656443 is 34465621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12656443 - 2²¹ = 10559291 is a prime.

It is not a weakly prime, because it can be changed into another prime (12656243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6328221 + 6328222.

It is an arithmetic number, because the mean of its divisors is an integer number (6328222).

Almost surely, 2^12656443 is an apocalyptic number.

12656443 is a deficient number, since it is larger than the sum of its proper divisors (1).

12656443 is an equidigital number, since it uses as much as digits as its factorization.

12656443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 12656443 is about 3557.5894929011. The cubic root of 12656443 is about 233.0436225250.

The spelling of 12656443 in words is "twelve million, six hundred fifty-six thousand, four hundred forty-three".