12639563 has 4 divisors (see below), whose sum is σ = 13075440. Its totient is φ = 12203688.

The previous prime is 12639559. The next prime is 12639577. The reversal of 12639563 is 36593621.

12639563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12639563 - 2² = 12639559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12633563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217895 + ... + 217952.

It is an arithmetic number, because the mean of its divisors is an integer number (3268860).

Almost surely, 2^12639563 is an apocalyptic number.

12639563 is a deficient number, since it is larger than the sum of its proper divisors (435877).

12639563 is an equidigital number, since it uses as much as digits as its factorization.

12639563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435876.

The product of its digits is 29160, while the sum is 35.

The square root of 12639563 is about 3555.2163084684. The cubic root of 12639563 is about 232.9399723793.

The spelling of 12639563 in words is "twelve million, six hundred thirty-nine thousand, five hundred sixty-three".