9918639884 has 24 divisors (see below), whose sum is σ = 17469849600. Its totient is φ = 4927303440.

The previous prime is 9918639881. The next prime is 9918639911. The reversal of 9918639884 is 4889368199.

9918639884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 9918639884.

It is not an unprimeable number, because it can be changed into a prime (9918639881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 910349 + ... + 921179.

It is an arithmetic number, because the mean of its divisors is an integer number (727910400).

Almost surely, 2^9918639884 is an apocalyptic number.

It is an amenable number.

9918639884 is a deficient number, since it is larger than the sum of its proper divisors (7551209716).

9918639884 is a wasteful number, since it uses less digits than its factorization.

9918639884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12293 (or 12291 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 65.

The square root of 9918639884 is about 99592.3686032218. The cubic root of 9918639884 is about 2148.5759370165.

The spelling of 9918639884 in words is "nine billion, nine hundred eighteen million, six hundred thirty-nine thousand, eight hundred eighty-four".