820392806 has 8 divisors (see below), whose sum is σ = 1230718104. Its totient is φ = 410153440.

The previous prime is 820392799. The next prime is 820392847. The reversal of 820392806 is 608293028.

It is a happy number.

820392806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×820392806² = 1346088712273107272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 820392806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14321 + ... + 42963.

It is an arithmetic number, because the mean of its divisors is an integer number (153839763).

Almost surely, 2^820392806 is an apocalyptic number.

It is a pronic number, being equal to 28642×28643.

820392806 is a deficient number, since it is larger than the sum of its proper divisors (410325298).

820392806 is a wasteful number, since it uses less digits than its factorization.

820392806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42966.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 820392806 is about 28642.4999956359. The cubic root of 820392806 is about 936.1395947775.

The spelling of 820392806 in words is "eight hundred twenty million, three hundred ninety-two thousand, eight hundred six".