12639639 has 8 divisors (see below), whose sum is σ = 16874352. Its totient is φ = 8415680.

The previous prime is 12639637. The next prime is 12639659. The reversal of 12639639 is 93693621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12639639 - 2¹ = 12639637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12639597 and 12639606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639637) 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 7 ways as a sum of consecutive naturals, for example, 649 + ... + 5069.

It is an arithmetic number, because the mean of its divisors is an integer number (2109294).

Almost surely, 2^12639639 is an apocalyptic number.

12639639 is a deficient number, since it is larger than the sum of its proper divisors (4234713).

12639639 is an equidigital number, since it uses as much as digits as its factorization.

12639639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5377.

The product of its digits is 52488, while the sum is 39.

The square root of 12639639 is about 3555.2269969722. The cubic root of 12639639 is about 232.9404392573.

The spelling of 12639639 in words is "twelve million, six hundred thirty-nine thousand, six hundred thirty-nine".