823812 has 36 divisors (see below), whose sum is σ = 2123856. Its totient is φ = 246480.

The previous prime is 823799. The next prime is 823819. The reversal of 823812 is 218328.

It is a super-2 number, since 2×823812² = 1357332422688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (823819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10389 + ... + 10467.

It is an arithmetic number, because the mean of its divisors is an integer number (58996).

2⁸²³⁸¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 823812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061928).

823812 is an abundant number, since it is smaller than the sum of its proper divisors (1300044).

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

823812 is a wasteful number, since it uses less digits than its factorization.

823812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 95 counting only the distinct ones).

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

The square root of 823812 is about 907.6408981530. The cubic root of 823812 is about 93.7438324832.

The spelling of 823812 in words is "eight hundred twenty-three thousand, eight hundred twelve".