216818 has 16 divisors (see below), whose sum is σ = 393984. Its totient is φ = 87360.

The previous prime is 216803. The next prime is 216829. The reversal of 216818 is 818612.

It is an unprimeable number.

216818 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218 + ... + 693.

It is an arithmetic number, because the mean of its divisors is an integer number (24624).

2²¹⁶⁸¹⁸ is an apocalyptic number.

216818 is a deficient number, since it is larger than the sum of its proper divisors (177166).

216818 is a wasteful number, since it uses less digits than its factorization.

216818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937.

The product of its digits is 768, while the sum is 26.

The square root of 216818 is about 465.6371978268. The cubic root of 216818 is about 60.0756453304.

The spelling of 216818 in words is "two hundred sixteen thousand, eight hundred eighteen".