820394783 has 6 divisors (see below), whose sum is σ = 888356664. Its totient is φ = 757287336.

The previous prime is 820394779. The next prime is 820394849. The reversal of 820394783 is 387493028.

It is not a de Polignac number, because 820394783 - 2² = 820394779 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820394723) 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 5 ways as a sum of consecutive naturals, for example, 2427035 + ... + 2427372.

It is an arithmetic number, because the mean of its divisors is an integer number (148059444).

Almost surely, 2^820394783 is an apocalyptic number.

820394783 is a deficient number, since it is larger than the sum of its proper divisors (67961881).

820394783 is a wasteful number, since it uses less digits than its factorization.

820394783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4854433 (or 4854420 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 820394783 is about 28642.5345072673. The cubic root of 820394783 is about 936.1403467533.

The spelling of 820394783 in words is "eight hundred twenty million, three hundred ninety-four thousand, seven hundred eighty-three".