999804384 has 120 divisors (see below), whose sum is σ = 2950101000. Its totient is φ = 332169984.

The previous prime is 999804359. The next prime is 999804389. The reversal of 999804384 is 483408999.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 999804384.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999804389) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1293022 + ... + 1293794.

It is an arithmetic number, because the mean of its divisors is an integer number (24584175).

Almost surely, 2^999804384 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 999804384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475050500).

999804384 is an abundant number, since it is smaller than the sum of its proper divisors (1950296616).

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

999804384 is a wasteful number, since it uses less digits than its factorization.

999804384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 999804384 is about 31619.6834898770. The cubic root of 999804384 is about 999.9347904145.

The spelling of 999804384 in words is "nine hundred ninety-nine million, eight hundred four thousand, three hundred eighty-four".