189445 has 4 divisors (see below), whose sum is σ = 227340. Its totient is φ = 151552.

The previous prime is 189439. The next prime is 189463. The reversal of 189445 is 544981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544981 = 271 ⋅2011.

It can be written as a sum of positive squares in 2 ways, for example, as 54756 + 134689 = 234^2 + 367^2 .

It is a cyclic number.

It is not a de Polignac number, because 189445 - 2³ = 189437 is a prime.

189445 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18940 + ... + 18949.

It is an arithmetic number, because the mean of its divisors is an integer number (56835).

2¹⁸⁹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

189445 is a deficient number, since it is larger than the sum of its proper divisors (37895).

189445 is an equidigital number, since it uses as much as digits as its factorization.

189445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37894.

The product of its digits is 5760, while the sum is 31.

The square root of 189445 is about 435.2528001059. The cubic root of 189445 is about 57.4329400946.

The spelling of 189445 in words is "one hundred eighty-nine thousand, four hundred forty-five".