1998218 has 8 divisors (see below), whose sum is σ = 3021312. Its totient is φ = 991116.

The previous prime is 1998209. The next prime is 1998221. The reversal of 1998218 is 8128991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3680 + ... + 4187.

It is an arithmetic number, because the mean of its divisors is an integer number (377664).

2^1998218 is an apocalyptic number.

1998218 is a deficient number, since it is larger than the sum of its proper divisors (1023094).

1998218 is a wasteful number, since it uses less digits than its factorization.

1998218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7996.

The product of its digits is 10368, while the sum is 38.

The square root of 1998218 is about 1413.5833898288. The cubic root of 1998218 is about 125.9546742152.

The spelling of 1998218 in words is "one million, nine hundred ninety-eight thousand, two hundred eighteen".