813822 has 8 divisors (see below), whose sum is σ = 1627656. Its totient is φ = 271272.

The previous prime is 813817. The next prime is 813829. The reversal of 813822 is 228318.

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

813822 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 813792 and 813801.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813822.

It is not an unprimeable number, because it can be changed into a prime (813829) 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, 67813 + ... + 67824.

It is an arithmetic number, because the mean of its divisors is an integer number (203457).

2⁸¹³⁸²² is an apocalyptic number.

813822 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813822 is a wasteful number, since it uses less digits than its factorization.

813822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135642.

The product of its digits is 768, while the sum is 24.

The square root of 813822 is about 902.1208344784. The cubic root of 813822 is about 93.3633605200.

The spelling of 813822 in words is "eight hundred thirteen thousand, eight hundred twenty-two".