998111898 has 72 divisors (see below), whose sum is σ = 2554123104. Its totient is φ = 275942160.

The previous prime is 998111897. The next prime is 998111899. The reversal of 998111898 is 898111899.

It is an interprime number because it is at equal distance from previous prime (998111897) and next prime (998111899).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998111897) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 116965 + ... + 125207.

It is an arithmetic number, because the mean of its divisors is an integer number (35473932).

Almost surely, 2^998111898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998111898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1277061552).

998111898 is an abundant number, since it is smaller than the sum of its proper divisors (1556011206).

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

998111898 is a wasteful number, since it uses less digits than its factorization.

998111898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8320 (or 8286 counting only the distinct ones).

The product of its digits is 373248, while the sum is 54.

The square root of 998111898 is about 31592.9089828715. The cubic root of 998111898 is about 999.3702361474.

Subtracting from 998111898 its reverse (898111899), we obtain a palindrome (99999999).

It can be divided in two parts, 998 and 111898, that added together give a square (112896 = 336²).

The spelling of 998111898 in words is "nine hundred ninety-eight million, one hundred eleven thousand, eight hundred ninety-eight".