189217 has 4 divisors (see below), whose sum is σ = 216256. Its totient is φ = 162180.

The previous prime is 189199. The next prime is 189223. The reversal of 189217 is 712981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189257) 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, 13509 + ... + 13522.

It is an arithmetic number, because the mean of its divisors is an integer number (54064).

2¹⁸⁹²¹⁷ is an apocalyptic number.

It is an amenable number.

189217 is a deficient number, since it is larger than the sum of its proper divisors (27039).

189217 is an equidigital number, since it uses as much as digits as its factorization.

189217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27038.

The product of its digits is 1008, while the sum is 28.

The square root of 189217 is about 434.9908045005. The cubic root of 189217 is about 57.4098903668.

It can be divided in two parts, 189 and 217, that added together give a triangular number (406 = T₂₈).

The spelling of 189217 in words is "one hundred eighty-nine thousand, two hundred seventeen".