9999989 is digitally balanced in base 2 and base 3, because in such bases 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 cyclic number.
It is a Duffinian number.
It is a congruent number.
Almost surely, 29999989 is an apocalyptic number.
It is an amenable number.
9999989 is a wasteful number, since it uses less digits than its factorization.
9999989 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 45066.
The square root of 9999989 is about 3162.2759209152. The cubic root of 9999989 is about 215.4433900072.
The spelling of 9999989 in words is "nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".