12639389 has 24 divisors (see below), whose sum is σ = 15887040. Its totient is φ = 9821952.

The previous prime is 12639379. The next prime is 12639433. The reversal of 12639389 is 98393621.

12639389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12639389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111797 + ... + 111909.

It is an arithmetic number, because the mean of its divisors is an integer number (661960).

Almost surely, 2^12639389 is an apocalyptic number.

12639389 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12639389 is a deficient number, since it is larger than the sum of its proper divisors (3247651).

12639389 is a wasteful number, since it uses less digits than its factorization.

12639389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 168 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 12639389 is about 3555.1918372994. The cubic root of 12639389 is about 232.9389034673.

The spelling of 12639389 in words is "twelve million, six hundred thirty-nine thousand, three hundred eighty-nine".