189709 has 4 divisors (see below), whose sum is σ = 204316. Its totient is φ = 175104.

The previous prime is 189701. The next prime is 189713. The reversal of 189709 is 907981.

189709 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 an emirpimes, since its reverse is a distinct semiprime: 907981 = 257 ⋅3533.

It can be written as a sum of positive squares in 2 ways, for example, as 21609 + 168100 = 147^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 189709 - 2³ = 189701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189701) 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, 7284 + ... + 7309.

It is an arithmetic number, because the mean of its divisors is an integer number (51079).

2¹⁸⁹⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

189709 is a deficient number, since it is larger than the sum of its proper divisors (14607).

189709 is a wasteful number, since it uses less digits than its factorization.

189709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14606.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 189709 is about 435.5559665531. Note that the first 3 decimals coincide. The cubic root of 189709 is about 57.4596061605.

It can be divided in two parts, 189 and 709, that added together give a palindrome (898).

The spelling of 189709 in words is "one hundred eighty-nine thousand, seven hundred nine".