1998318 has 32 divisors (see below), whose sum is σ = 4665600. Its totient is φ = 570360.

The previous prime is 1998301. The next prime is 1998319. The reversal of 1998318 is 8138991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1573 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2^1998318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2332800).

1998318 is an abundant number, since it is smaller than the sum of its proper divisors (2667282).

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

1998318 is an equidigital number, since it uses as much as digits as its factorization.

1998318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997 (or 983 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 1998318 is about 1413.6187604867. The cubic root of 1998318 is about 125.9567752968.

The spelling of 1998318 in words is "one million, nine hundred ninety-eight thousand, three hundred eighteen".