9991912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is an unprimeable number.
Almost surely, 29991912 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 9991912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10807200).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9991912 is a wasteful number, since it uses less digits than its factorization.
9991912 is an evil number, because the sum of its binary digits is even.
The square root of 9991912 is about 3160.9985763996. The cubic root of 9991912 is about 215.3853697776.
The spelling of 9991912 in words is "nine million, nine hundred ninety-one thousand, nine hundred twelve".