1999960000 has 70 divisors (see below), whose sum is σ = 4959350000. Its totient is φ = 799968000.

The previous prime is 1999959953. The next prime is 1999960003. The reversal of 1999960000 is 699991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999960003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15001 + ... + 64999.

Almost surely, 2^1999960000 is an apocalyptic number.

1999960000 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 1999960000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2479675000).

1999960000 is an abundant number, since it is smaller than the sum of its proper divisors (2959390000).

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

1999960000 is an frugal number, since it uses more digits than its factorization.

1999960000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50031 (or 50006 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 1999960000 is about 44720.9123341642. The cubic root of 1999960000 is about 1259.9126503652.

The spelling of 1999960000 in words is "one billion, nine hundred ninety-nine million, nine hundred sixty thousand".