216786 has 8 divisors (see below), whose sum is σ = 433584. Its totient is φ = 72260.

The previous prime is 216781. The next prime is 216787. The reversal of 216786 is 687612.

It is a happy number.

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

216786 is an admirable number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (216781) by changing a digit.

216786 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18060 + ... + 18071.

It is an arithmetic number, because the mean of its divisors is an integer number (54198).

2²¹⁶⁷⁸⁶ is an apocalyptic number.

216786 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216786 is a wasteful number, since it uses less digits than its factorization.

216786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36136.

The product of its digits is 4032, while the sum is 30.

The square root of 216786 is about 465.6028350429. The cubic root of 216786 is about 60.0726896791.

The spelling of 216786 in words is "two hundred sixteen thousand, seven hundred eighty-six".