9981937920 has 144 divisors (see below), whose sum is σ = 31948701120. Its totient is φ = 2656100352.

The previous prime is 9981937909. The next prime is 9981937937. The reversal of 9981937920 is 297391899.

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, 1952007 + ... + 1957113.

It is an arithmetic number, because the mean of its divisors is an integer number (221865980).

Almost surely, 2^9981937920 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 9981937920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15974350560).

9981937920 is an abundant number, since it is smaller than the sum of its proper divisors (21966763200).

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

9981937920 is a wasteful number, since it uses less digits than its factorization.

9981937920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5640 (or 5626 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 57.

The square root of 9981937920 is about 99909.6487832882. The cubic root of 9981937920 is about 2153.1367892341.

The spelling of 9981937920 in words is "nine billion, nine hundred eighty-one million, nine hundred thirty-seven thousand, nine hundred twenty".