998118 has 36 divisors (see below), whose sum is σ = 2392884. Its totient is φ = 298200.

The previous prime is 998117. The next prime is 998147. The reversal of 998118 is 811899.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14023 + ... + 14093.

It is an arithmetic number, because the mean of its divisors is an integer number (66469).

2⁹⁹⁸¹¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1196442).

998118 is an abundant number, since it is smaller than the sum of its proper divisors (1394766).

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

998118 is a wasteful number, since it uses less digits than its factorization.

998118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 87 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 998118 is about 999.0585568424. The cubic root of 998118 is about 99.9372272708.

It can be divided in two parts, 9981 and 18, that added together give a palindrome (9999).

The spelling of 998118 in words is "nine hundred ninety-eight thousand, one hundred eighteen".