1998489600 has 216 divisors, whose sum is σ = 7158936330. Its totient is φ = 532807680.

The previous prime is 1998489589. The next prime is 1998489631. The reversal of 1998489600 is 69848991.

1998489600 is a `hidden beast` number, since 19 + 98 + 489 + 60 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 823919616 + 1174569984 = 28704^2 + 34272^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 458632 + ... + 462968.

Almost surely, 2^1998489600 is an apocalyptic number.

1998489600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998489600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3579468165).

1998489600 is an abundant number, since it is smaller than the sum of its proper divisors (5160446730).

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

1998489600 is a wasteful number, since it uses less digits than its factorization.

1998489600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375 (or 4347 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 1998489600 is about 44704.4695752002. The cubic root of 1998489600 is about 1259.6038058949.

The spelling of 1998489600 in words is "one billion, nine hundred ninety-eight million, four hundred eighty-nine thousand, six hundred".