999800 has 24 divisors (see below), whose sum is σ = 2325000. Its totient is φ = 399840.

The previous prime is 999773. The next prime is 999809. The reversal of 999800 is 8999.

999800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999809) by changing a digit.

999800 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2300 + ... + 2699.

It is an arithmetic number, because the mean of its divisors is an integer number (96875).

2⁹⁹⁹⁸⁰⁰ is an apocalyptic number.

It is an amenable number.

999800 is an abundant number, since it is smaller than the sum of its proper divisors (1325200).

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

999800 is a wasteful number, since it uses less digits than its factorization.

999800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5015 (or 5006 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 999800 is about 999.8999949995. The cubic root of 999800 is about 99.9933328888.

The spelling of 999800 in words is "nine hundred ninety-nine thousand, eight hundred".