9989872 has 20 divisors (see below), whose sum is σ = 19407240. Its totient is φ = 4981568.

The previous prime is 9989849. The next prime is 9989879. The reversal of 9989872 is 2789899.

9989872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8454 + ... + 9562.

It is an arithmetic number, because the mean of its divisors is an integer number (970362).

Almost surely, 2^9989872 is an apocalyptic number.

It is an amenable number.

9989872 is a deficient number, since it is larger than the sum of its proper divisors (9417368).

9989872 is a wasteful number, since it uses less digits than its factorization.

9989872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680 (or 1674 counting only the distinct ones).

The product of its digits is 653184, while the sum is 52.

The square root of 9989872 is about 3160.6758770871. The cubic root of 9989872 is about 215.3707107193.

The spelling of 9989872 in words is "nine million, nine hundred eighty-nine thousand, eight hundred seventy-two".