1998984 has 64 divisors (see below), whose sum is σ = 5544000. Its totient is φ = 596736.

The previous prime is 1998977. The next prime is 1998991. The reversal of 1998984 is 4898991.

It is an interprime number because it is at equal distance from previous prime (1998977) and next prime (1998991).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13342 + ... + 13490.

It is an arithmetic number, because the mean of its divisors is an integer number (86625).

2^1998984 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 1998984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2772000).

1998984 is an abundant number, since it is smaller than the sum of its proper divisors (3545016).

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

1998984 is a wasteful number, since it uses less digits than its factorization.

1998984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 210 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 1998984 is about 1413.8543064970. The cubic root of 1998984 is about 125.9707667127.

The spelling of 1998984 in words is "one million, nine hundred ninety-eight thousand, nine hundred eighty-four".