216799 has 4 divisors (see below), whose sum is σ = 236520. Its totient is φ = 197080.

The previous prime is 216791. The next prime is 216803. The reversal of 216799 is 997612.

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

It is a cyclic number.

It is not a de Polignac number, because 216799 - 2³ = 216791 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216791) 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 3 ways as a sum of consecutive naturals, for example, 9844 + ... + 9865.

It is an arithmetic number, because the mean of its divisors is an integer number (59130).

2²¹⁶⁷⁹⁹ is an apocalyptic number.

216799 is a deficient number, since it is larger than the sum of its proper divisors (19721).

216799 is a wasteful number, since it uses less digits than its factorization.

216799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19720.

The product of its digits is 6804, while the sum is 34.

The square root of 216799 is about 465.6167952297. The cubic root of 216799 is about 60.0738904475.

The spelling of 216799 in words is "two hundred sixteen thousand, seven hundred ninety-nine".