989898 has 64 divisors (see below), whose sum is σ = 2553600. Its totient is φ = 254016.

The previous prime is 989887. The next prime is 989909. The reversal of 989898 is 898989.

989898 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (989887) and next prime (989909).

It is an alternating number because its digits alternate between odd and even.

989898 is an undulating number in base 10.

989898 is a modest number, since divided by 9898 gives 98 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 989898.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26736 + ... + 26772.

It is an arithmetic number, because the mean of its divisors is an integer number (39900).

2⁹⁸⁹⁸⁹⁸ is an apocalyptic number.

989898 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 989898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276800).

989898 is an abundant number, since it is smaller than the sum of its proper divisors (1563702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989898 is a wasteful number, since it uses less digits than its factorization.

989898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76 (or 62 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The square root of 989898 is about 994.9361788577. The cubic root of 989898 is about 99.6621263665.

Subtracting from 989898 its reverse (898989), we obtain a palindrome (90909).

The spelling of 989898 in words is "nine hundred eighty-nine thousand, eight hundred ninety-eight".