989878986 has 96 divisors (see below), whose sum is σ = 2328056640. Its totient is φ = 302994432.

The previous prime is 989878979. The next prime is 989878997. The reversal of 989878986 is 689878989.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1757941 + ... + 1758503.

It is an arithmetic number, because the mean of its divisors is an integer number (24250590).

Almost surely, 2^989878986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989878986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1164028320).

989878986 is an abundant number, since it is smaller than the sum of its proper divisors (1338177654).

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

989878986 is a wasteful number, since it uses less digits than its factorization.

989878986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 737 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 72.

The square root of 989878986 is about 31462.3423476384. The cubic root of 989878986 is about 996.6148825767.

The spelling of 989878986 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, nine hundred eighty-six".