12638907 has 6 divisors (see below), whose sum is σ = 18256212. Its totient is φ = 8425932.

The previous prime is 12638903. The next prime is 12638909. The reversal of 12638907 is 70983621.

12638907 is a `hidden beast` number, since 12 + 638 + 9 + 0 + 7 = 666.

It is not a de Polignac number, because 12638907 - 2² = 12638903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12638903) 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 5 ways as a sum of consecutive naturals, for example, 702153 + ... + 702170.

It is an arithmetic number, because the mean of its divisors is an integer number (3042702).

Almost surely, 2^12638907 is an apocalyptic number.

12638907 is a deficient number, since it is larger than the sum of its proper divisors (5617305).

12638907 is a wasteful number, since it uses less digits than its factorization.

12638907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404329 (or 1404326 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 12638907 is about 3555.1240484686. The cubic root of 12638907 is about 232.9359424070.

The spelling of 12638907 in words is "twelve million, six hundred thirty-eight thousand, nine hundred seven".