9986891 has 4 divisors (see below), whose sum is σ = 10019112. Its totient is φ = 9954672.

The previous prime is 9986881. The next prime is 9986897. The reversal of 9986891 is 1986899.

9986891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9986891 - 2¹⁰ = 9985867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9986897) 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, 15641 + ... + 16266.

It is an arithmetic number, because the mean of its divisors is an integer number (2504778).

Almost surely, 2^9986891 is an apocalyptic number.

9986891 is a deficient number, since it is larger than the sum of its proper divisors (32221).

9986891 is a wasteful number, since it uses less digits than its factorization.

9986891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32220.

The product of its digits is 279936, while the sum is 50.

The square root of 9986891 is about 3160.2042655499. The cubic root of 9986891 is about 215.3492862220.

The spelling of 9986891 in words is "nine million, nine hundred eighty-six thousand, eight hundred ninety-one".