1999819008 has 216 divisors, whose sum is σ = 6622805280. Its totient is φ = 573972480.

The previous prime is 1999819007. The next prime is 1999819009. The reversal of 1999819008 is 8009189991.

It is an interprime number because it is at equal distance from previous prime (1999819007) and next prime (1999819009).

It is not an unprimeable number, because it can be changed into a prime (1999819007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 479460 + ... + 483612.

Almost surely, 2^1999819008 is an apocalyptic number.

1999819008 is a gapful number since it is divisible by the number (18) 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 1999819008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3311402640).

1999819008 is an abundant number, since it is smaller than the sum of its proper divisors (4622986272).

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

1999819008 is a wasteful number, since it uses less digits than its factorization.

1999819008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4205 (or 4188 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 54.

The square root of 1999819008 is about 44719.3359521360. The cubic root of 1999819008 is about 1259.8830428099.

The spelling of 1999819008 in words is "one billion, nine hundred ninety-nine million, eight hundred nineteen thousand, eight".