823993823 has 4 divisors (see below), whose sum is σ = 837959880. Its totient is φ = 810027768.

The previous prime is 823993817. The next prime is 823993829. The reversal of 823993823 is 328399328.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (823993817) and next prime (823993829).

It is a cyclic number.

It is not a de Polignac number, because 823993823 - 2¹⁴ = 823977439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823993829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6982940 + ... + 6983057.

It is an arithmetic number, because the mean of its divisors is an integer number (209489970).

Almost surely, 2^823993823 is an apocalyptic number.

823993823 is a deficient number, since it is larger than the sum of its proper divisors (13966057).

823993823 is a wasteful number, since it uses less digits than its factorization.

823993823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13966056.

The product of its digits is 559872, while the sum is 47.

The square root of 823993823 is about 28705.2925956173. The cubic root of 823993823 is about 937.5072868885.

The spelling of 823993823 in words is "eight hundred twenty-three million, nine hundred ninety-three thousand, eight hundred twenty-three".