812003 has 4 divisors (see below), whose sum is σ = 854760. Its totient is φ = 769248.

The previous prime is 811997. The next prime is 812011. The reversal of 812003 is 300218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 812003 - 2⁸ = 811747 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (812033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21350 + ... + 21387.

It is an arithmetic number, because the mean of its divisors is an integer number (213690).

2⁸¹²⁰⁰³ is an apocalyptic number.

812003 is a deficient number, since it is larger than the sum of its proper divisors (42757).

812003 is a wasteful number, since it uses less digits than its factorization.

812003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42756.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 812003 is about 901.1120906968. The cubic root of 812003 is about 93.2937488034.

The spelling of 812003 in words is "eight hundred twelve thousand, three".