1998188 has 12 divisors (see below), whose sum is σ = 3529680. Its totient is φ = 989712.

The previous prime is 1998181. The next prime is 1998209. The reversal of 1998188 is 8818991.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1998181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1856 + ... + 2727.

It is an arithmetic number, because the mean of its divisors is an integer number (294140).

2^1998188 is an apocalyptic number.

It is an amenable number.

1998188 is a deficient number, since it is larger than the sum of its proper divisors (1531492).

1998188 is a wasteful number, since it uses less digits than its factorization.

1998188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4696 (or 4694 counting only the distinct ones).

The product of its digits is 41472, while the sum is 44.

The square root of 1998188 is about 1413.5727784589. The cubic root of 1998188 is about 125.9540438770.

The spelling of 1998188 in words is "one million, nine hundred ninety-eight thousand, one hundred eighty-eight".