12639434 has 8 divisors (see below), whose sum is σ = 19024740. Its totient is φ = 6297856.

The previous prime is 12639433. The next prime is 12639457. The reversal of 12639434 is 43493621.

It can be written as a sum of positive squares in 2 ways, for example, as 12623809 + 15625 = 3553^2 + 125^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 12639434.

It is not an unprimeable number, because it can be changed into a prime (12639433) 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 3 ways as a sum of consecutive naturals, for example, 10199 + ... + 11370.

Almost surely, 2^12639434 is an apocalyptic number.

12639434 is a deficient number, since it is larger than the sum of its proper divisors (6385306).

12639434 is a wasteful number, since it uses less digits than its factorization.

12639434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21864.

The product of its digits is 15552, while the sum is 32.

The square root of 12639434 is about 3555.1981660661. The cubic root of 12639434 is about 232.9391799110.

The spelling of 12639434 in words is "twelve million, six hundred thirty-nine thousand, four hundred thirty-four".