216393 has 8 divisors (see below), whose sum is σ = 305568. Its totient is φ = 135744.

The previous prime is 216379. The next prime is 216397. The reversal of 216393 is 393612.

216393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216393 - 2⁶ = 216329 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (216397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2071 + ... + 2172.

It is an arithmetic number, because the mean of its divisors is an integer number (38196).

2²¹⁶³⁹³ is an apocalyptic number.

It is an amenable number.

216393 is a deficient number, since it is larger than the sum of its proper divisors (89175).

216393 is a wasteful number, since it uses less digits than its factorization.

216393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4263.

The product of its digits is 972, while the sum is 24.

The square root of 216393 is about 465.1806100860. The cubic root of 216393 is about 60.0363668420.

The spelling of 216393 in words is "two hundred sixteen thousand, three hundred ninety-three".