289645 has 8 divisors (see below), whose sum is σ = 354456. Its totient is φ = 227136.

The previous prime is 289643. The next prime is 289657. The reversal of 289645 is 546982.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 139876 + 149769 = 374^2 + 387^2 .

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 289645 - 2¹ = 289643 is a prime.

It is a super-3 number, since 3×289645³ = 72898629291033375, which contains 333 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 289645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 282 + ... + 811.

It is an arithmetic number, because the mean of its divisors is an integer number (44307).

2²⁸⁹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

289645 is a deficient number, since it is larger than the sum of its proper divisors (64811).

289645 is a wasteful number, since it uses less digits than its factorization.

289645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151.

The product of its digits is 17280, while the sum is 34.

The square root of 289645 is about 538.1867705546. The cubic root of 289645 is about 66.1640394563.

The spelling of 289645 in words is "two hundred eighty-nine thousand, six hundred forty-five".