289885 has 4 divisors (see below), whose sum is σ = 347868. Its totient is φ = 231904.

The previous prime is 289871. The next prime is 289889. The reversal of 289885 is 588982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93636 + 196249 = 306^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 289885 - 2⁵ = 289853 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

289885 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289889) 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, 28984 + ... + 28993.

It is an arithmetic number, because the mean of its divisors is an integer number (86967).

2²⁸⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

289885 is a deficient number, since it is larger than the sum of its proper divisors (57983).

289885 is an equidigital number, since it uses as much as digits as its factorization.

289885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57982.

The product of its digits is 46080, while the sum is 40.

The square root of 289885 is about 538.4096953065. The cubic root of 289885 is about 66.1823089306.

The spelling of 289885 in words is "two hundred eighty-nine thousand, eight hundred eighty-five".