989898840 has 256 divisors, whose sum is σ = 3935692800. Its totient is φ = 216387072.

The previous prime is 989898839. The next prime is 989898857. The reversal of 989898840 is 48898989.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 171034 + ... + 176726.

It is an arithmetic number, because the mean of its divisors is an integer number (15373800).

Almost surely, 2^989898840 is an apocalyptic number.

989898840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989898840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1967846400).

989898840 is an abundant number, since it is smaller than the sum of its proper divisors (2945793960).

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

989898840 is a wasteful number, since it uses less digits than its factorization.

989898840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5743 (or 5733 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 63.

The square root of 989898840 is about 31462.6578661117. The cubic root of 989898840 is about 996.6215455661.

The spelling of 989898840 in words is "nine hundred eighty-nine million, eight hundred ninety-eight thousand, eight hundred forty".