9989520 has 80 divisors (see below), whose sum is σ = 31337280. Its totient is φ = 2632192.

The previous prime is 9989509. The next prime is 9989569. The reversal of 9989520 is 259899.

It is a tau number, because it is divible by the number of its divisors (80).

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, 25486 + ... + 25874.

It is an arithmetic number, because the mean of its divisors is an integer number (391716).

Almost surely, 2^9989520 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 9989520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15668640).

9989520 is an abundant number, since it is smaller than the sum of its proper divisors (21347760).

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

9989520 is a wasteful number, since it uses less digits than its factorization.

9989520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 506 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 9989520 is about 3160.6201923040. The cubic root of 9989520 is about 215.3681811113.

The spelling of 9989520 in words is "nine million, nine hundred eighty-nine thousand, five hundred twenty".