823813 has 8 divisors (see below), whose sum is σ = 858816. Its totient is φ = 789600.

The previous prime is 823799. The next prime is 823819. The reversal of 823813 is 318328.

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

It is a cyclic number.

It is not a de Polignac number, because 823813 - 2¹³ = 815621 is a prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2770 + ... + 3052.

It is an arithmetic number, because the mean of its divisors is an integer number (107352).

2⁸²³⁸¹³ is an apocalyptic number.

It is an amenable number.

823813 is a deficient number, since it is larger than the sum of its proper divisors (35003).

823813 is a wasteful number, since it uses less digits than its factorization.

823813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 1152, while the sum is 25.

The square root of 823813 is about 907.6414490315. The cubic root of 823813 is about 93.7438704141.

The spelling of 823813 in words is "eight hundred twenty-three thousand, eight hundred thirteen".