812923 has 4 divisors (see below), whose sum is σ = 860760. Its totient is φ = 765088.

The previous prime is 812921. The next prime is 812939. The reversal of 812923 is 329218.

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 812923 - 2¹ = 812921 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812921) 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, 23893 + ... + 23926.

It is an arithmetic number, because the mean of its divisors is an integer number (215190).

2⁸¹²⁹²³ is an apocalyptic number.

812923 is a deficient number, since it is larger than the sum of its proper divisors (47837).

812923 is a wasteful number, since it uses less digits than its factorization.

812923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47836.

The product of its digits is 864, while the sum is 25.

The square root of 812923 is about 901.6224265179. The cubic root of 812923 is about 93.3289694672.

The spelling of 812923 in words is "eight hundred twelve thousand, nine hundred twenty-three".