12639705 has 32 divisors (see below), whose sum is σ = 22208256. Its totient is φ = 6100224.

The previous prime is 12639701. The next prime is 12639709. The reversal of 12639705 is 50793621.

12639705 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12639701) and next prime (12639709).

It is not a de Polignac number, because 12639705 - 2² = 12639701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12639701) 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 31 ways as a sum of consecutive naturals, for example, 9724 + ... + 10946.

It is an arithmetic number, because the mean of its divisors is an integer number (694008).

Almost surely, 2^12639705 is an apocalyptic number.

12639705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12639705 is a deficient number, since it is larger than the sum of its proper divisors (9568551).

12639705 is a wasteful number, since it uses less digits than its factorization.

12639705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 12639705 is about 3555.2362790678. The cubic root of 12639705 is about 232.9408447025.

The spelling of 12639705 in words is "twelve million, six hundred thirty-nine thousand, seven hundred five".