823388479 has 4 divisors (see below), whose sum is σ = 823545520. Its totient is φ = 823231440.

The previous prime is 823388473. The next prime is 823388497. The reversal of 823388479 is 974883328.

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 823388479 - 2³ = 823388471 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 (823388471) 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, 70374 + ... + 81235.

It is an arithmetic number, because the mean of its divisors is an integer number (205886380).

Almost surely, 2^823388479 is an apocalyptic number.

823388479 is a deficient number, since it is larger than the sum of its proper divisors (157041).

823388479 is a wasteful number, since it uses less digits than its factorization.

823388479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157040.

The product of its digits is 2322432, while the sum is 52.

The square root of 823388479 is about 28694.7465400899. The cubic root of 823388479 is about 937.2776518977.

The spelling of 823388479 in words is "eight hundred twenty-three million, three hundred eighty-eight thousand, four hundred seventy-nine".