It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-19968209 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 19968209.
Almost surely, 219968209 is an apocalyptic number.
It is an amenable number.
19968209 is an equidigital number, since it uses as much as digits as its factorization.
19968209 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1887.
The square root of 19968209 is about 4468.5801995712. The cubic root of 19968209 is about 271.2978619699.
The spelling of 19968209 in words is "nineteen million, nine hundred sixty-eight thousand, two hundred nine".