It is a happy number.
It is an Ulam number.
It is a d-powerful number, because it can be written as 92 + 92 + 94 + 85 + 78 + 27 + 411 .
It is an unprimeable number.
Almost surely, 29998724 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.
9998724 is a wasteful number, since it uses less digits than its factorization.
9998724 is an evil number, because the sum of its binary digits is even.
The square root of 9998724 is about 3162.0759004173. The cubic root of 9998724 is about 215.4343050845.
The spelling of 9998724 in words is "nine million, nine hundred ninety-eight thousand, seven hundred twenty-four".