999803 has 8 divisors (see below), whose sum is σ = 1149408. Its totient is φ = 851904.

The previous prime is 999773. The next prime is 999809. The reversal of 999803 is 308999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999803 - 2¹⁰ = 998779 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999803.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1325 + ... + 1937.

It is an arithmetic number, because the mean of its divisors is an integer number (143676).

2⁹⁹⁹⁸⁰³ is an apocalyptic number.

999803 is a deficient number, since it is larger than the sum of its proper divisors (149605).

999803 is a wasteful number, since it uses less digits than its factorization.

999803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 999803 is about 999.9014951484. The cubic root of 999803 is about 99.9934329021.

The spelling of 999803 in words is "nine hundred ninety-nine thousand, eight hundred three".