989911840 has 96 divisors (see below), whose sum is σ = 2437585920. Its totient is φ = 379468800.

The previous prime is 989911823. The next prime is 989911859. The reversal of 989911840 is 48119989.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 539725 + ... + 541555.

It is an arithmetic number, because the mean of its divisors is an integer number (25391520).

Almost surely, 2^989911840 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 989911840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1218792960).

989911840 is an abundant number, since it is smaller than the sum of its proper divisors (1447674080).

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

989911840 is a wasteful number, since it uses less digits than its factorization.

989911840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986 (or 1978 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 989911840 is about 31462.8644595498. The cubic root of 989911840 is about 996.6259083094.

The spelling of 989911840 in words is "nine hundred eighty-nine million, nine hundred eleven thousand, eight hundred forty".