216785 has 8 divisors (see below), whose sum is σ = 262656. Its totient is φ = 171760.

The previous prime is 216781. The next prime is 216787. The reversal of 216785 is 587612.

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

It is not a de Polignac number, because 216785 - 2² = 216781 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a nialpdrome in base 12.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 842 + ... + 1068.

It is an arithmetic number, because the mean of its divisors is an integer number (32832).

2²¹⁶⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

216785 is a deficient number, since it is larger than the sum of its proper divisors (45871).

216785 is a wasteful number, since it uses less digits than its factorization.

216785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423.

The product of its digits is 3360, while the sum is 29.

The square root of 216785 is about 465.6017611651. The cubic root of 216785 is about 60.0725973103.

It can be divided in two parts, 216 and 785, that added together give a palindrome (1001).

The spelling of 216785 in words is "two hundred sixteen thousand, seven hundred eighty-five".