189209 has 4 divisors (see below), whose sum is σ = 190080. Its totient is φ = 188340.

The previous prime is 189199. The next prime is 189223. The reversal of 189209 is 902981.

189209 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 189209 - 2⁸ = 188953 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189229) 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, 212 + ... + 650.

It is an arithmetic number, because the mean of its divisors is an integer number (47520).

2¹⁸⁹²⁰⁹ is an apocalyptic number.

It is an amenable number.

189209 is a deficient number, since it is larger than the sum of its proper divisors (871).

189209 is an equidigital number, since it uses as much as digits as its factorization.

189209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 189209 is about 434.9816088066. The cubic root of 189209 is about 57.4090812682.

The spelling of 189209 in words is "one hundred eighty-nine thousand, two hundred nine".