12639438 has 24 divisors (see below), whose sum is σ = 31297968. Its totient is φ = 3611232.

The previous prime is 12639433. The next prime is 12639457. The reversal of 12639438 is 83493621.

12639438 is a `hidden beast` number, since 12 + 639 + 4 + 3 + 8 = 666.

12639438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50031 + ... + 50282.

It is an arithmetic number, because the mean of its divisors is an integer number (1304082).

Almost surely, 2^12639438 is an apocalyptic number.

12639438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12639438 is an abundant number, since it is smaller than the sum of its proper divisors (18658530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12639438 is a wasteful number, since it uses less digits than its factorization.

12639438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100328 (or 100325 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 12639438 is about 3555.1987286226. The cubic root of 12639438 is about 232.9392044837.

It can be divided in two parts, 1263 and 9438, that added together give a palindrome (10701).

The spelling of 12639438 in words is "twelve million, six hundred thirty-nine thousand, four hundred thirty-eight".