816799 has 8 divisors (see below), whose sum is σ = 902880. Its totient is φ = 734976.

The previous prime is 816779. The next prime is 816811. The reversal of 816799 is 997618.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816799 is a prime.

It is a Duffinian number.

816799 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816709) 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, 654 + ... + 1435.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2⁸¹⁶⁷⁹⁹ is an apocalyptic number.

816799 is a deficient number, since it is larger than the sum of its proper divisors (86081).

816799 is a wasteful number, since it uses less digits than its factorization.

816799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129.

The product of its digits is 27216, while the sum is 40.

The square root of 816799 is about 903.7693289773. The cubic root of 816799 is about 93.4770645413.

It can be divided in two parts, 8 and 16799, that added together give a 5-th power (16807 = 7⁵).

The spelling of 816799 in words is "eight hundred sixteen thousand, seven hundred ninety-nine".