289405 has 4 divisors (see below), whose sum is σ = 347292. Its totient is φ = 231520.

The previous prime is 289397. The next prime is 289417. The reversal of 289405 is 504982.

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 45369 + 244036 = 213^2 + 494^2 .

It is not a de Polignac number, because 289405 - 2³ = 289397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28936 + ... + 28945.

It is an arithmetic number, because the mean of its divisors is an integer number (86823).

2²⁸⁹⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

289405 is a deficient number, since it is larger than the sum of its proper divisors (57887).

289405 is an equidigital number, since it uses as much as digits as its factorization.

289405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57886.

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

The square root of 289405 is about 537.9637534258. The cubic root of 289405 is about 66.1457598872.

The spelling of 289405 in words is "two hundred eighty-nine thousand, four hundred five".