812023 has 4 divisors (see below), whose sum is σ = 819720. Its totient is φ = 804328.

The previous prime is 812011. The next prime is 812033. The reversal of 812023 is 320218.

It is a happy number.

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 812023 - 2⁵ = 811991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 811988 and 812006.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3688 + ... + 3901.

It is an arithmetic number, because the mean of its divisors is an integer number (204930).

2⁸¹²⁰²³ is an apocalyptic number.

812023 is a deficient number, since it is larger than the sum of its proper divisors (7697).

812023 is a wasteful number, since it uses less digits than its factorization.

812023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7696.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 812023 is about 901.1231880270. The cubic root of 812023 is about 93.2945147528.

The spelling of 812023 in words is "eight hundred twelve thousand, twenty-three".