8638638 has 8 divisors (see below), whose sum is σ = 17277288. Its totient is φ = 2879544.

The previous prime is 8638633. The next prime is 8638661. The reversal of 8638638 is 8368368.

It is a sphenic number, since it is the product of 3 distinct primes.

8638638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 8638638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8638633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 719881 + ... + 719892.

It is an arithmetic number, because the mean of its divisors is an integer number (2159661).

Almost surely, 2^8638638 is an apocalyptic number.

8638638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

8638638 is a wasteful number, since it uses less digits than its factorization.

8638638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439778.

The product of its digits is 165888, while the sum is 42.

The square root of 8638638 is about 2939.1560013038. The cubic root of 8638638 is about 205.1863306863.

The spelling of 8638638 in words is "eight million, six hundred thirty-eight thousand, six hundred thirty-eight".