189305 has 4 divisors (see below), whose sum is σ = 227172. Its totient is φ = 151440.

The previous prime is 189271. The next prime is 189307. The reversal of 189305 is 503981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503981 = 47 ⋅10723.

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 50176 = 373^2 + 224^2 .

It is not a de Polignac number, because 189305 - 2¹⁰ = 188281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18926 + ... + 18935.

It is an arithmetic number, because the mean of its divisors is an integer number (56793).

2¹⁸⁹³⁰⁵ is an apocalyptic number.

It is an amenable number.

189305 is a deficient number, since it is larger than the sum of its proper divisors (37867).

189305 is an equidigital number, since it uses as much as digits as its factorization.

189305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37866.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 189305 is about 435.0919443060. The cubic root of 189305 is about 57.4187889459.

It can be divided in two parts, 189 and 305, that added together give a palindrome (494).

The spelling of 189305 in words is "one hundred eighty-nine thousand, three hundred five".