9984891 has 16 divisors (see below), whose sum is σ = 15313664. Its totient is φ = 5668704.

The previous prime is 9984881. The next prime is 9984893. The reversal of 9984891 is 1984899.

It is not a de Polignac number, because 9984891 - 2⁵ = 9984859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9984891.

It is not an unprimeable number, because it can be changed into a prime (9984893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1965 + ... + 4881.

It is an arithmetic number, because the mean of its divisors is an integer number (957104).

Almost surely, 2^9984891 is an apocalyptic number.

9984891 is a deficient number, since it is larger than the sum of its proper divisors (5328773).

9984891 is a wasteful number, since it uses less digits than its factorization.

9984891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3090.

The product of its digits is 186624, while the sum is 48.

The square root of 9984891 is about 3159.8878144643. The cubic root of 9984891 is about 215.3349097983.

The spelling of 9984891 in words is "nine million, nine hundred eighty-four thousand, eight hundred ninety-one".