265889 has 8 divisors (see below), whose sum is σ = 290472. Its totient is φ = 241920.

The previous prime is 265883. The next prime is 265891. The reversal of 265889 is 988562.

It can be written as a sum of positive squares in 4 ways, for example, as 54289 + 211600 = 233^2 + 460^2 .

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 265889 - 2⁴ = 265873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (265883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1379 + ... + 1559.

It is an arithmetic number, because the mean of its divisors is an integer number (36309).

2²⁶⁵⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

265889 is a deficient number, since it is larger than the sum of its proper divisors (24583).

265889 is a wasteful number, since it uses less digits than its factorization.

265889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307.

The product of its digits is 34560, while the sum is 38.

The square root of 265889 is about 515.6442572162. The cubic root of 265889 is about 64.3033289767.

The spelling of 265889 in words is "two hundred sixty-five thousand, eight hundred eighty-nine".