289565 has 8 divisors (see below), whose sum is σ = 359640. Its totient is φ = 223552.

The previous prime is 289559. The next prime is 289573. The reversal of 289565 is 565982.

It can be written as a sum of positive squares in 4 ways, for example, as 121 + 289444 = 11^2 + 538^2 .

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 289565 - 2⁸ = 289309 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854 + ... + 1143.

It is an arithmetic number, because the mean of its divisors is an integer number (44955).

2²⁸⁹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

289565 is a deficient number, since it is larger than the sum of its proper divisors (70075).

289565 is a wasteful number, since it uses less digits than its factorization.

289565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031.

The product of its digits is 21600, while the sum is 35.

The square root of 289565 is about 538.1124417815. The cubic root of 289565 is about 66.1579473890.

The spelling of 289565 in words is "two hundred eighty-nine thousand, five hundred sixty-five".