823969979 has 16 divisors (see below), whose sum is σ = 994060800. Its totient is φ = 667185984.

The previous prime is 823969919. The next prime is 823969997. The reversal of 823969979 is 979969328.

823969979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 823969979 - 2⁸ = 823969723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823969919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39119 + ... + 56375.

It is an arithmetic number, because the mean of its divisors is an integer number (62128800).

Almost surely, 2^823969979 is an apocalyptic number.

823969979 is a deficient number, since it is larger than the sum of its proper divisors (170090821).

823969979 is a wasteful number, since it uses less digits than its factorization.

823969979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17642.

The product of its digits is 13226976, while the sum is 62.

The square root of 823969979 is about 28704.8772685061. The cubic root of 823969979 is about 937.4982438841.

The spelling of 823969979 in words is "eight hundred twenty-three million, nine hundred sixty-nine thousand, nine hundred seventy-nine".