999980000 has 60 divisors (see below), whose sum is σ = 2460150000. Its totient is φ = 399984000.

The previous prime is 999979961. The next prime is 999980011. The reversal of 999980000 is 89999.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5000 + ... + 44999.

It is an arithmetic number, because the mean of its divisors is an integer number (41002500).

Almost surely, 2^999980000 is an apocalyptic number.

It is an amenable number.

999980000 is an abundant number, since it is smaller than the sum of its proper divisors (1460170000).

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

999980000 is an equidigital number, since it uses as much as digits as its factorization.

999980000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50029 (or 50006 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 44.

The square root of 999980000 is about 31622.4603723366. The cubic root of 999980000 is about 999.9933332889.

The spelling of 999980000 in words is "nine hundred ninety-nine million, nine hundred eighty thousand".