811822 has 8 divisors (see below), whose sum is σ = 1328472. Its totient is φ = 369000.

The previous prime is 811819. The next prime is 811861. The reversal of 811822 is 228118.

811822 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 36901 = 811822 / (8 + 1 + 1 + 8 + 2 + 2).

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 811793 and 811802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18429 + ... + 18472.

It is an arithmetic number, because the mean of its divisors is an integer number (166059).

2⁸¹¹⁸²² is an apocalyptic number.

811822 is a deficient number, since it is larger than the sum of its proper divisors (516650).

811822 is a wasteful number, since it uses less digits than its factorization.

811822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36914.

The product of its digits is 256, while the sum is 22.

The square root of 811822 is about 901.0116536427. The cubic root of 811822 is about 93.2868163892.

The spelling of 811822 in words is "eight hundred eleven thousand, eight hundred twenty-two".