It is a happy number.
9999864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a nude number because it is divisible by every one of its digits.
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 9999864.
It is a congruent number.
Almost surely, 29999864 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.
9999864 is a wasteful number, since it uses less digits than its factorization.
9999864 is an evil number, because the sum of its binary digits is even.
The square root of 9999864 is about 3162.2561566072. The cubic root of 9999864 is about 215.4424923217.
The spelling of 9999864 in words is "nine million, nine hundred ninety-nine thousand, eight hundred sixty-four".