216893 has 4 divisors (see below), whose sum is σ = 219420. Its totient is φ = 214368.

The previous prime is 216877. The next prime is 216899. The reversal of 216893 is 398612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 131044 + 85849 = 362^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 216893 - 2⁴ = 216877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1130 + ... + 1307.

It is an arithmetic number, because the mean of its divisors is an integer number (54855).

2²¹⁶⁸⁹³ is an apocalyptic number.

It is an amenable number.

216893 is a deficient number, since it is larger than the sum of its proper divisors (2527).

216893 is an equidigital number, since it uses as much as digits as its factorization.

216893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526.

The product of its digits is 2592, while the sum is 29.

The square root of 216893 is about 465.7177256665. The cubic root of 216893 is about 60.0825714989.

The spelling of 216893 in words is "two hundred sixteen thousand, eight hundred ninety-three".