289445 has 16 divisors (see below), whose sum is σ = 385392. Its totient is φ = 207360.

The previous prime is 289439. The next prime is 289453. The reversal of 289445 is 544982.

It is a Cunningham number, because it is equal to 538²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 75076 + 214369 = 274^2 + 463^2 .

It is not a de Polignac number, because 289445 - 2⁶ = 289381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3929 + ... + 4001.

It is an arithmetic number, because the mean of its divisors is an integer number (24087).

2²⁸⁹⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

289445 is a deficient number, since it is larger than the sum of its proper divisors (95947).

289445 is a wasteful number, since it uses less digits than its factorization.

289445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152.

The product of its digits is 11520, while the sum is 32.

The square root of 289445 is about 538.0009293672. Note that the first 3 decimals coincide. The cubic root of 289445 is about 66.1488071837.

The spelling of 289445 in words is "two hundred eighty-nine thousand, four hundred forty-five".