Subtracting from 9898 its reverse (8989), we obtain a palindrome (909).
9898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
9898 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between odd and even.
9898 is an undulating number in base 10.
It is a plaindrome in base 12 and base 16.
It is an unprimeable number.
9898 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
29898 is an apocalyptic number.
9898 is a gapful number since it is divisible by the number (98) formed by its first and last digit.
9898 is a wasteful number, since it uses less digits than its factorization.
9898 is an odious number, because the sum of its binary digits is odd.
The square root of 9898 is about 99.4886928249. The cubic root of 9898 is about 21.4708456472.
The spelling of 9898 in words is "nine thousand, eight hundred ninety-eight".