12638659 has 16 divisors (see below), whose sum is σ = 14192640. Its totient is φ = 11158560.

The previous prime is 12638621. The next prime is 12638663. The reversal of 12638659 is 95683621.

It is a cyclic number.

It is not a de Polignac number, because 12638659 - 2⁹ = 12638147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12638699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99454 + ... + 99580.

It is an arithmetic number, because the mean of its divisors is an integer number (887040).

Almost surely, 2^12638659 is an apocalyptic number.

12638659 is a deficient number, since it is larger than the sum of its proper divisors (1553981).

12638659 is a wasteful number, since it uses less digits than its factorization.

12638659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330.

The product of its digits is 77760, while the sum is 40.

The square root of 12638659 is about 3555.0891690645. The cubic root of 12638659 is about 232.9344188446.

The spelling of 12638659 in words is "twelve million, six hundred thirty-eight thousand, six hundred fifty-nine".