820884047 has 4 divisors (see below), whose sum is σ = 821008776. Its totient is φ = 820759320.

The previous prime is 820883993. The next prime is 820884073. The reversal of 820884047 is 740488028.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820884047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 820883995 and 820884013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820886047) 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, 51908 + ... + 65849.

It is an arithmetic number, because the mean of its divisors is an integer number (205252194).

Almost surely, 2^820884047 is an apocalyptic number.

820884047 is a deficient number, since it is larger than the sum of its proper divisors (124729).

820884047 is a wasteful number, since it uses less digits than its factorization.

820884047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124728.

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 820884047 is about 28651.0740985395. The cubic root of 820884047 is about 936.3264070743.

The spelling of 820884047 in words is "eight hundred twenty million, eight hundred eighty-four thousand, forty-seven".