12608639 has 4 divisors (see below), whose sum is σ = 12815400. Its totient is φ = 12401880.

The previous prime is 12608627. The next prime is 12608671. The reversal of 12608639 is 93680621.

12608639 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 12608639 - 2⁸ = 12608383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12608599 and 12608608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12608699) 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, 103289 + ... + 103410.

It is an arithmetic number, because the mean of its divisors is an integer number (3203850).

Almost surely, 2^12608639 is an apocalyptic number.

12608639 is a deficient number, since it is larger than the sum of its proper divisors (206761).

12608639 is an equidigital number, since it uses as much as digits as its factorization.

12608639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206760.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 12608639 is about 3550.8645426149. The cubic root of 12608639 is about 232.7498466512.

The spelling of 12608639 in words is "twelve million, six hundred eight thousand, six hundred thirty-nine".