189745 has 8 divisors (see below), whose sum is σ = 230184. Its totient is φ = 150144.

The previous prime is 189743. The next prime is 189757. The reversal of 189745 is 547981.

It is a happy number.

189745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6561 + 183184 = 81^2 + 428^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189745 - 2¹ = 189743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189745.

It is not an unprimeable number, because it can be changed into a prime (189743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 547 + ... + 823.

It is an arithmetic number, because the mean of its divisors is an integer number (28773).

2¹⁸⁹⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

189745 is a deficient number, since it is larger than the sum of its proper divisors (40439).

189745 is a wasteful number, since it uses less digits than its factorization.

189745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its digits is 10080, while the sum is 34.

The square root of 189745 is about 435.5972910843. The cubic root of 189745 is about 57.4632405250.

The spelling of 189745 in words is "one hundred eighty-nine thousand, seven hundred forty-five".