289391 has 8 divisors (see below), whose sum is σ = 317520. Its totient is φ = 262528.

The previous prime is 289381. The next prime is 289397. The reversal of 289391 is 193982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 289391.

It is not an unprimeable number, because it can be changed into a prime (289397) 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, 200 + ... + 786.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2²⁸⁹³⁹¹ is an apocalyptic number.

289391 is a deficient number, since it is larger than the sum of its proper divisors (28129).

289391 is a wasteful number, since it uses less digits than its factorization.

289391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633.

The product of its digits is 3888, while the sum is 32.

The square root of 289391 is about 537.9507412394. The cubic root of 289391 is about 66.1446932671.

The spelling of 289391 in words is "two hundred eighty-nine thousand, three hundred ninety-one".