It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-9999997 is a prime.
It is a Duffinian number.
9999997 is a lucky number.
It is a nialpdrome in base 10.
It is a congruent number.
Almost surely, 29999997 is an apocalyptic number.
It is an amenable number.
9999997 is a wasteful number, since it uses less digits than its factorization.
9999997 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1428578.
The square root of 9999997 is about 3162.2771858267. The cubic root of 9999997 is about 215.4434474588.
The spelling of 9999997 in words is "nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".