999109000 has 64 divisors (see below), whose sum is σ = 2356623360. Its totient is φ = 396446400.

The previous prime is 999108949. The next prime is 999109019. The reversal of 999109000 is 901999.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123067 + ... + 130933.

It is an arithmetic number, because the mean of its divisors is an integer number (36822240).

Almost surely, 2^999109000 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 999109000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1178311680).

999109000 is an abundant number, since it is smaller than the sum of its proper divisors (1357514360).

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

999109000 is a wasteful number, since it uses less digits than its factorization.

999109000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8015 (or 8001 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 999109000 is about 31608.6855152188. The cubic root of 999109000 is about 999.7029117473.

The spelling of 999109000 in words is "nine hundred ninety-nine million, one hundred nine thousand".