8638812 has 120 divisors (see below), whose sum is σ = 27890016. Its totient is φ = 2270592.

The previous prime is 8638807. The next prime is 8638843. The reversal of 8638812 is 2188368.

8638812 is a `hidden beast` number, since 8 + 638 + 8 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 39 ways as a sum of consecutive naturals, for example, 29338 + ... + 29630.

Almost surely, 2^8638812 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 8638812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13945008).

8638812 is an abundant number, since it is smaller than the sum of its proper divisors (19251204).

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

8638812 is a wasteful number, since it uses less digits than its factorization.

8638812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 318 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 8638812 is about 2939.1856014890. The cubic root of 8638812 is about 205.1877083024.

The spelling of 8638812 in words is "eight million, six hundred thirty-eight thousand, eight hundred twelve".