217383 has 4 divisors (see below), whose sum is σ = 289848. Its totient is φ = 144920.

The previous prime is 217369. The next prime is 217387. The reversal of 217383 is 383712.

217383 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 217383 - 2⁴ = 217367 is a prime.

It is a D-number.

217383 is a lucky 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 217383.

It is not an unprimeable number, because it can be changed into a prime (217387) 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, 36228 + ... + 36233.

It is an arithmetic number, because the mean of its divisors is an integer number (72462).

2²¹⁷³⁸³ is an apocalyptic number.

217383 is a deficient number, since it is larger than the sum of its proper divisors (72465).

217383 is an equidigital number, since it uses as much as digits as its factorization.

217383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72464.

The product of its digits is 1008, while the sum is 24.

The square root of 217383 is about 466.2434986142. The cubic root of 217383 is about 60.1277832198.

The spelling of 217383 in words is "two hundred seventeen thousand, three hundred eighty-three".