1999800000 has 504 divisors, whose sum is σ = 7893338544. Its totient is φ = 480000000.

The previous prime is 1999799959. The next prime is 1999800031. The reversal of 1999800000 is 89991.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19799950 + ... + 19800050.

It is an arithmetic number, because the mean of its divisors is an integer number (15661386).

Almost surely, 2^1999800000 is an apocalyptic number.

1999800000 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 1999800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3946669272).

1999800000 is an abundant number, since it is smaller than the sum of its proper divisors (5893538544).

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

1999800000 is a wasteful number, since it uses less digits than its factorization.

1999800000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1999800000 is about 44719.1234261138. The cubic root of 1999800000 is about 1259.8790511266.

Adding to 1999800000 its reverse (89991), we get a palindrome (1999889991).

The spelling of 1999800000 in words is "one billion, nine hundred ninety-nine million, eight hundred thousand".