12646643 has 4 divisors (see below), whose sum is σ = 12656160. Its totient is φ = 12637128.

The previous prime is 12646597. The next prime is 12646661. The reversal of 12646643 is 34664621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12646643 - 2¹² = 12642547 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (12646693) 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 in 3 ways as a sum of consecutive naturals, for example, 2363 + ... + 5556.

It is an arithmetic number, because the mean of its divisors is an integer number (3164040).

Almost surely, 2^12646643 is an apocalyptic number.

12646643 is a deficient number, since it is larger than the sum of its proper divisors (9517).

12646643 is an equidigital number, since it uses as much as digits as its factorization.

12646643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9516.

The product of its digits is 20736, while the sum is 32.

The square root of 12646643 is about 3556.2118890752. The cubic root of 12646643 is about 232.9834577215.

The spelling of 12646643 in words is "twelve million, six hundred forty-six thousand, six hundred forty-three".