9181998 has 48 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 2622456.

The previous prime is 9181987. The next prime is 9182003. The reversal of 9181998 is 8991819.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 2053 + ... + 4751.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^9181998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9181998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11793600).

9181998 is an abundant number, since it is smaller than the sum of its proper divisors (14405202).

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

9181998 is a wasteful number, since it uses less digits than its factorization.

9181998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723 (or 2711 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 9181998 is about 3030.1811827018. The cubic root of 9181998 is about 209.4011510515.

It can be divided in two parts, 918 and 1998, that added together give a square (2916 = 54²).

The spelling of 9181998 in words is "nine million, one hundred eighty-one thousand, nine hundred ninety-eight".