1998979800 has 96 divisors (see below), whose sum is σ = 6313859280. Its totient is φ = 522995200.

The previous prime is 1998979793. The next prime is 1998979817. The reversal of 1998979800 is 89798991.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 370 + ... + 63230.

Almost surely, 2^1998979800 is an apocalyptic number.

1998979800 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 1998979800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3156929640).

1998979800 is an abundant number, since it is smaller than the sum of its proper divisors (4314879480).

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

1998979800 is a wasteful number, since it uses less digits than its factorization.

1998979800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62933 (or 62924 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 60.

The square root of 1998979800 is about 44709.9519122980. The cubic root of 1998979800 is about 1259.7067848827.

The spelling of 1998979800 in words is "one billion, nine hundred ninety-eight million, nine hundred seventy-nine thousand, eight hundred".