216293 has 12 divisors (see below), whose sum is σ = 274848.
Its totient is φ = 165360.
The previous prime is 216289. The next prime is 216317. The reversal of 216293 is 392612.
It is not a de Polignac number, because 216293 - 22 = 216289 is a prime.
It is a Curzon number.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216293.
It is not an unprimeable number, because it can be changed into a prime (216233) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4055 + ... + 4107.
It is an arithmetic number, because the mean of its divisors is an integer number (22904).
2216293 is an apocalyptic number.
It is an amenable number.
216293 is a deficient number, since it is larger than the sum of its proper divisors (58555).
216293 is an equidigital number, since it uses as much as digits as its factorization.
With its successor (216294) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (124).
216293 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 124 (or 71 counting only the distinct ones).
The product of its digits is 648, while the sum is 23.
The square root of 216293 is about 465.0731125318.
The cubic root of 216293 is about 60.0271173719.
The spelling of 216293 in words is "two hundred sixteen thousand, two hundred ninety-three".