9960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a nialpdrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 9960.
9960 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
29960 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 9960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9960 is a wasteful number, since it uses less digits than its factorization.
9960 is an odious number, because the sum of its binary digits is odd.
The square root of 9960 is about 99.7997995990. The cubic root of 9960 is about 21.5155827180.
Subtracting from 9960 its reverse (699), we obtain a cube (9261 = 213).
The spelling of 9960 in words is "nine thousand, nine hundred sixty".