823919992399 has 4 divisors (see below), whose sum is σ = 941622848464. Its totient is φ = 706217136336.

The previous prime is 823919992393. The next prime is 823919992433. The reversal of 823919992399 is 993299919328.

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

It is a cyclic number.

It is not a de Polignac number, because 823919992399 - 2¹⁷ = 823919861327 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 (823919992393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58851428022 + ... + 58851428035.

It is an arithmetic number, because the mean of its divisors is an integer number (235405712116).

Almost surely, 2^823919992399 is an apocalyptic number.

823919992399 is a deficient number, since it is larger than the sum of its proper divisors (117702856065).

823919992399 is a wasteful number, since it uses less digits than its factorization.

823919992399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117702856064.

The product of its digits is 153055008, while the sum is 73.

The spelling of 823919992399 in words is "eight hundred twenty-three billion, nine hundred nineteen million, nine hundred ninety-two thousand, three hundred ninety-nine".