189385 has 12 divisors (see below), whose sum is σ = 264708. Its totient is φ = 129696.

The previous prime is 189377. The next prime is 189389. The reversal of 189385 is 583981.

It can be written as a sum of positive squares in 2 ways, for example, as 35721 + 153664 = 189^2 + 392^2 .

It is not a de Polignac number, because 189385 - 2³ = 189377 is a prime.

It is an Ulam number.

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 189385.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142 + ... + 631.

It is an arithmetic number, because the mean of its divisors is an integer number (22059).

2¹⁸⁹³⁸⁵ is an apocalyptic number.

It is an amenable number.

189385 is a deficient number, since it is larger than the sum of its proper divisors (75323).

189385 is an equidigital number, since it uses as much as digits as its factorization.

189385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 785 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 189385 is about 435.1838691863. The cubic root of 189385 is about 57.4268761706.

Adding to 189385 its product of digits (8640), we get a square (198025 = 445²).

The spelling of 189385 in words is "one hundred eighty-nine thousand, three hundred eighty-five".