216873 has 6 divisors (see below), whose sum is σ = 313274. Its totient is φ = 144576.

The previous prime is 216859. The next prime is 216877. The reversal of 216873 is 378612.

It can be written as a sum of positive squares in only one way, i.e., 205209 + 11664 = 453^2 + 108^2 .

It is not a de Polignac number, because 216873 - 2⁵ = 216841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216877) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12040 + ... + 12057.

2²¹⁶⁸⁷³ is an apocalyptic number.

It is an amenable number.

216873 is a deficient number, since it is larger than the sum of its proper divisors (96401).

216873 is a wasteful number, since it uses less digits than its factorization.

216873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24103 (or 24100 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 216873 is about 465.6962529375. The cubic root of 216873 is about 60.0807246767.

It can be divided in two parts, 216 and 873, that added together give a square (1089 = 33²).

The spelling of 216873 in words is "two hundred sixteen thousand, eight hundred seventy-three".