989898989898918 has 64 divisors (see below), whose sum is σ = 2184273275616000. Its totient is φ = 296568192476160.

The previous prime is 989898989898887. The next prime is 989898989898919. The reversal of 989898989898918 is 819898989898989.

It is a junction number, because it is equal to n+sod(n) for n = 989898989898795 and 989898989898804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989898989898919) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47945605 + ... + 65410847.

It is an arithmetic number, because the mean of its divisors is an integer number (34129269931500).

Almost surely, 2^{989898989898918} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989898989898918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092136637808000).

989898989898918 is an abundant number, since it is smaller than the sum of its proper divisors (1194374285717082).

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

989898989898918 is a wasteful number, since it uses less digits than its factorization.

989898989898918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17474997.

The product of its digits is 10030613004288, while the sum is 120.

The spelling of 989898989898918 in words is "nine hundred eighty-nine trillion, eight hundred ninety-eight billion, nine hundred eighty-nine million, eight hundred ninety-eight thousand, nine hundred eighteen".