823855009 has 8 divisors (see below), whose sum is σ = 860463360. Its totient is φ = 787312416.

The previous prime is 823855001. The next prime is 823855013. The reversal of 823855009 is 900558328.

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 823855009 - 2³ = 823855001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823855001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10104 + ... + 41830.

It is an arithmetic number, because the mean of its divisors is an integer number (107557920).

Almost surely, 2^823855009 is an apocalyptic number.

It is an amenable number.

823855009 is a deficient number, since it is larger than the sum of its proper divisors (36608351).

823855009 is a wasteful number, since it uses less digits than its factorization.

823855009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32879.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 823855009 is about 28702.8745772963. The cubic root of 823855009 is about 937.4546382555.

The spelling of 823855009 in words is "eight hundred twenty-three million, eight hundred fifty-five thousand, nine".