811923 has 24 divisors (see below), whose sum is σ = 1323264. Its totient is φ = 432960.

The previous prime is 811919. The next prime is 811931. The reversal of 811923 is 329118.

811923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 811923 - 2² = 811919 is a prime.

It is an Ulam number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 811893 and 811902.

It is not an unprimeable number, because it can be changed into a prime (811933) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19783 + ... + 19823.

It is an arithmetic number, because the mean of its divisors is an integer number (55136).

2⁸¹¹⁹²³ is an apocalyptic number.

811923 is a deficient number, since it is larger than the sum of its proper divisors (511341).

811923 is a wasteful number, since it uses less digits than its factorization.

811923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 74 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

The square root of 811923 is about 901.0677000093. The cubic root of 811923 is about 93.2906848799.

The spelling of 811923 in words is "eight hundred eleven thousand, nine hundred twenty-three".