9898989 is nontrivially palindromic in base 10.
9898989 is an esthetic number in base 10, because in such base it adjacent digits differ by 1.
It is a sphenic number, since it is the product of 3 distinct primes.
It is an alternating number because its digits alternate between odd and even.
9898989 is an undulating number in base 10.
It is a congruent number.
Almost surely, 29898989 is an apocalyptic number.
It is an amenable number.
9898989 is a wasteful number, since it uses less digits than its factorization.
9898989 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5187.
The square root of 9898989 is about 3146.2658819623. The cubic root of 9898989 is about 214.7156073982.
The spelling of 9898989 in words is "nine million, eight hundred ninety-eight thousand, nine hundred eighty-nine".