It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991248.
It is an unprimeable number.
2991248 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 991248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1299024).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
991248 is a wasteful number, since it uses less digits than its factorization.
991248 is an evil number, because the sum of its binary digits is even.
The square root of 991248 is about 995.6143831826. The cubic root of 991248 is about 99.7074114208.
The spelling of 991248 in words is "nine hundred ninety-one thousand, two hundred forty-eight".