12906639 has 12 divisors (see below), whose sum is σ = 18674136. Its totient is φ = 8590032.

The previous prime is 12906589. The next prime is 12906667. The reversal of 12906639 is 93660921.

12906639 is a `hidden beast` number, since 12 + 9 + 0 + 6 + 639 = 666.

12906639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12906639 - 2⁷ = 12906511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12906139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9469 + ... + 10745.

It is an arithmetic number, because the mean of its divisors is an integer number (1556178).

Almost surely, 2^12906639 is an apocalyptic number.

12906639 is a deficient number, since it is larger than the sum of its proper divisors (5767497).

12906639 is a wasteful number, since it uses less digits than its factorization.

12906639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406 (or 2403 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 12906639 is about 3592.5811055563. The cubic root of 12906639 is about 234.5692365301.

The spelling of 12906639 in words is "twelve million, nine hundred six thousand, six hundred thirty-nine".