1998002188 has 48 divisors (see below), whose sum is σ = 4325171200. Its totient is φ = 786417984.

The previous prime is 1998002179. The next prime is 1998002191. The reversal of 1998002188 is 8812008991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58645 + ... + 86227.

Almost surely, 2^1998002188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998002188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162585600).

1998002188 is an abundant number, since it is smaller than the sum of its proper divisors (2327169012).

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

1998002188 is a wasteful number, since it uses less digits than its factorization.

1998002188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27806 (or 27804 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 46.

The square root of 1998002188 is about 44699.0177520715. The cubic root of 1998002188 is about 1259.5013959001.

The spelling of 1998002188 in words is "one billion, nine hundred ninety-eight million, two thousand, one hundred eighty-eight".