216885 has 16 divisors (see below), whose sum is σ = 365760. Its totient is φ = 109440.

The previous prime is 216877. The next prime is 216899. The reversal of 216885 is 588612.

It is not a de Polignac number, because 216885 - 2³ = 216877 is a prime.

It is a congruent number.

It is an unprimeable 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 15 ways as a sum of consecutive naturals, for example, 96 + ... + 665.

It is an arithmetic number, because the mean of its divisors is an integer number (22860).

2²¹⁶⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

216885 is a deficient number, since it is larger than the sum of its proper divisors (148875).

216885 is a wasteful number, since it uses less digits than its factorization.

216885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788.

The product of its digits is 3840, while the sum is 30.

The square root of 216885 is about 465.7091366937. The cubic root of 216885 is about 60.0818327836.

The spelling of 216885 in words is "two hundred sixteen thousand, eight hundred eighty-five".