999828 has 18 divisors (see below), whose sum is σ = 2527434. Its totient is φ = 333264.

The previous prime is 999809. The next prime is 999853. The reversal of 999828 is 828999.

It can be written as a sum of positive squares in only one way, i.e., 898704 + 101124 = 948^2 + 318^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999828.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13851 + ... + 13922.

It is an arithmetic number, because the mean of its divisors is an integer number (140413).

2⁹⁹⁹⁸²⁸ is an apocalyptic number.

It is an amenable number.

999828 is an abundant number, since it is smaller than the sum of its proper divisors (1527606).

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

999828 is a wasteful number, since it uses less digits than its factorization.

999828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27783 (or 27778 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 999828 is about 999.9139963017. The cubic root of 999828 is about 99.9942663379.

The spelling of 999828 in words is "nine hundred ninety-nine thousand, eight hundred twenty-eight".