It is a nialpdrome in base 10.
It is a congruent number.
It is an unprimeable number.
Almost surely, 29999984 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
9999984 is a wasteful number, since it uses less digits than its factorization.
9999984 is an evil number, because the sum of its binary digits is even.
The square root of 9999984 is about 3162.2751303452. The cubic root of 9999984 is about 215.4433540999.
The spelling of 9999984 in words is "nine million, nine hundred ninety-nine thousand, nine hundred eighty-four".