12638862 has 32 divisors (see below), whose sum is σ = 28569600. Its totient is φ = 4140504.

The previous prime is 12638849. The next prime is 12638893. The reversal of 12638862 is 26883621.

12638862 is a `hidden beast` number, since 12 + 638 + 8 + 6 + 2 = 666.

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, 1203 + ... + 5169.

It is an arithmetic number, because the mean of its divisors is an integer number (892800).

Almost surely, 2^12638862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12638862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14284800).

12638862 is an abundant number, since it is smaller than the sum of its proper divisors (15930738).

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

12638862 is a wasteful number, since it uses less digits than its factorization.

12638862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037 (or 4031 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 12638862 is about 3555.1177195699. The cubic root of 12638862 is about 232.9356659556.

The spelling of 12638862 in words is "twelve million, six hundred thirty-eight thousand, eight hundred sixty-two".