1998187008 has 160 divisors (see below), whose sum is σ = 5604926976. Its totient is φ = 631369728.

The previous prime is 1998187001. The next prime is 1998187013. The reversal of 1998187008 is 8007818991.

It is not an unprimeable number, because it can be changed into a prime (1998187001) 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, 5758291 + ... + 5758637.

Almost surely, 2^1998187008 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 1998187008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2802463488).

1998187008 is an abundant number, since it is smaller than the sum of its proper divisors (3606739968).

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

1998187008 is a wasteful number, since it uses less digits than its factorization.

1998187008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 51.

The square root of 1998187008 is about 44701.0850875010. The cubic root of 1998187008 is about 1259.5402303372.

The spelling of 1998187008 in words is "one billion, nine hundred ninety-eight million, one hundred eighty-seven thousand, eight".