12639788 has 48 divisors (see below), whose sum is σ = 27793920. Its totient is φ = 4904064.

The previous prime is 12639713. The next prime is 12639791. The reversal of 12639788 is 88793621.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11720 + ... + 12752.

It is an arithmetic number, because the mean of its divisors is an integer number (579040).

Almost surely, 2^12639788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12639788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13896960).

12639788 is an abundant number, since it is smaller than the sum of its proper divisors (15154132).

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

12639788 is a wasteful number, since it uses less digits than its factorization.

12639788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086 (or 1084 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 12639788 is about 3555.2479519718. The cubic root of 12639788 is about 232.9413545785.

The spelling of 12639788 in words is "twelve million, six hundred thirty-nine thousand, seven hundred eighty-eight".