9998389169920 has 144 divisors (see below), whose sum is σ = 24034352513472. Its totient is φ = 3985163550720.

The previous prime is 9998389169903. The next prime is 9998389169941. The reversal of 9998389169920 is 299619838999.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 697181950 + ... + 697196290.

It is an arithmetic number, because the mean of its divisors is an integer number (166905225788).

Almost surely, 2^{9998389169920} 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 9998389169920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12017176256736).

9998389169920 is an abundant number, since it is smaller than the sum of its proper divisors (14035963343552).

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

9998389169920 is a wasteful number, since it uses less digits than its factorization.

9998389169920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16258 (or 16244 counting only the distinct ones).

The product of its (nonzero) digits is 1224440064, while the sum is 82.

The spelling of 9998389169920 in words is "nine trillion, nine hundred ninety-eight billion, three hundred eighty-nine million, one hundred sixty-nine thousand, nine hundred twenty".