811873 has 4 divisors (see below), whose sum is σ = 814000. Its totient is φ = 809748.

The previous prime is 811871. The next prime is 811879. The reversal of 811873 is 378118.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 811873 - 2¹ = 811871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (203500).

2⁸¹¹⁸⁷³ is an apocalyptic number.

It is an amenable number.

811873 is a deficient number, since it is larger than the sum of its proper divisors (2127).

811873 is a wasteful number, since it uses less digits than its factorization.

811873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126.

The product of its digits is 1344, while the sum is 28.

The square root of 811873 is about 901.0399547190. The cubic root of 811873 is about 93.2887698256.

It can be divided in two parts, 8 and 11873, that added together give a square (11881 = 109²).

The spelling of 811873 in words is "eight hundred eleven thousand, eight hundred seventy-three".