216443 has 4 divisors (see below), whose sum is σ = 218688. Its totient is φ = 214200.

The previous prime is 216431. The next prime is 216451. The reversal of 216443 is 344612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216443 - 2⁶ = 216379 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216493) 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, 971 + ... + 1172.

It is an arithmetic number, because the mean of its divisors is an integer number (54672).

2²¹⁶⁴⁴³ is an apocalyptic number.

216443 is a deficient number, since it is larger than the sum of its proper divisors (2245).

216443 is a wasteful number, since it uses less digits than its factorization.

216443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244.

The product of its digits is 576, while the sum is 20.

The square root of 216443 is about 465.2343495487. The cubic root of 216443 is about 60.0409905084.

The spelling of 216443 in words is "two hundred sixteen thousand, four hundred forty-three".