989105900 has 72 divisors (see below), whose sum is σ = 2351099520. Its totient is φ = 359511040.

The previous prime is 989105891. The next prime is 989105903. The reversal of 989105900 is 9501989.

It is not an unprimeable number, because it can be changed into a prime (989105903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39269 + ... + 59331.

It is an arithmetic number, because the mean of its divisors is an integer number (32654160).

Almost surely, 2^989105900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989105900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1175549760).

989105900 is an abundant number, since it is smaller than the sum of its proper divisors (1361993620).

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

989105900 is a wasteful number, since it uses less digits than its factorization.

989105900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20123 (or 20116 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 989105900 is about 31450.0540540076. The cubic root of 989105900 is about 996.3553661148.

The spelling of 989105900 in words is "nine hundred eighty-nine million, one hundred five thousand, nine hundred".