999889000 has 128 divisors (see below), whose sum is σ = 2703093120. Its totient is φ = 342144000.

The previous prime is 999888979. The next prime is 999889027. The reversal of 999889000 is 988999.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 184327 + ... + 189673.

It is an arithmetic number, because the mean of its divisors is an integer number (21117915).

Almost surely, 2^999889000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999889000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1351546560).

999889000 is an abundant number, since it is smaller than the sum of its proper divisors (1703204120).

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

999889000 is a wasteful number, since it uses less digits than its factorization.

999889000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5396 (or 5382 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 999889000 is about 31621.0214888767. The cubic root of 999889000 is about 999.9629986309.

The spelling of 999889000 in words is "nine hundred ninety-nine million, eight hundred eighty-nine thousand".