12639357 has 12 divisors (see below), whose sum is σ = 18702684. Its totient is φ = 8220480.

The previous prime is 12639353. The next prime is 12639359. The reversal of 12639357 is 75393621.

12639357 is a `hidden beast` number, since 12 + 639 + 3 + 5 + 7 = 666.

12639357 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1390041 + 11249316 = 1179^2 + 3354^2 .

It is not a de Polignac number, because 12639357 - 2² = 12639353 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639353) 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 11 ways as a sum of consecutive naturals, for example, 16758 + ... + 17495.

It is an arithmetic number, because the mean of its divisors is an integer number (1558557).

Almost surely, 2^12639357 is an apocalyptic number.

It is an amenable number.

12639357 is a deficient number, since it is larger than the sum of its proper divisors (6063327).

12639357 is a wasteful number, since it uses less digits than its factorization.

12639357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34300 (or 34297 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 12639357 is about 3555.1873368361. The cubic root of 12639357 is about 232.9387068847.

It can be divided in two parts, 12639 and 357, that added together give a square (12996 = 114²).

The spelling of 12639357 in words is "twelve million, six hundred thirty-nine thousand, three hundred fifty-seven".