1000999989000 has 768 divisors, whose sum is σ = 3845185344000. Its totient is φ = 232646400000.

The previous prime is 1000999988987. The next prime is 1000999989007. The reversal of 1000999989000 is 9899990001.

It is not an unprimeable number, because it can be changed into a prime (1000999989007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 433519846 + ... + 433522154.

It is an arithmetic number, because the mean of its divisors is an integer number (5006751750).

Almost surely, 2^{1000999989000} is an apocalyptic number.

1000999989000 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 1000999989000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1922592672000).

1000999989000 is an abundant number, since it is smaller than the sum of its proper divisors (2844185355000).

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

1000999989000 is a wasteful number, since it uses less digits than its factorization.

1000999989000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527 (or 2510 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 54.

The spelling of 1000999989000 in words is "one trillion, nine hundred ninety-nine million, nine hundred eighty-nine thousand".