999993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is a D-number.
It is a Duffinian number.
It is a nialpdrome in base 10.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999993.
2999993 is an apocalyptic number.
It is an amenable number.
999993 is a wasteful number, since it uses less digits than its factorization.
999993 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 333334.
The square root of 999993 is about 999.9964999939. The cubic root of 999993 is about 99.9997666661. Note that the first 3 decimals are identical.
The spelling of 999993 in words is "nine hundred ninety-nine thousand, nine hundred ninety-three".