205489 has 4 divisors (see below), whose sum is σ = 208624. Its totient is φ = 202356.

The previous prime is 205487. The next prime is 205493. The reversal of 205489 is 984502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984502 = 2 ⋅492251.

It is a cyclic number.

It is not a de Polignac number, because 205489 - 2¹ = 205487 is a prime.

It is a Duffinian number.

205489 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (205483) 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, 1467 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (52156).

2²⁰⁵⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

205489 is a deficient number, since it is larger than the sum of its proper divisors (3135).

205489 is an equidigital number, since it uses as much as digits as its factorization.

205489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 205489 is about 453.3089454224. The cubic root of 205489 is about 59.0105314917.

The spelling of 205489 in words is "two hundred five thousand, four hundred eighty-nine".