289687 has 4 divisors (see below), whose sum is σ = 292096. Its totient is φ = 287280.

The previous prime is 289669. The next prime is 289717. The reversal of 289687 is 786982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 289687 - 2⁷ = 289559 is a prime.

It is a Duffinian number.

289687 is a lucky number.

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289607) 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 3 ways as a sum of consecutive naturals, for example, 1014 + ... + 1267.

It is an arithmetic number, because the mean of its divisors is an integer number (73024).

2²⁸⁹⁶⁸⁷ is an apocalyptic number.

289687 is a deficient number, since it is larger than the sum of its proper divisors (2409).

289687 is a wasteful number, since it uses less digits than its factorization.

289687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408.

The product of its digits is 48384, while the sum is 40.

The square root of 289687 is about 538.2257890514. The cubic root of 289687 is about 66.1672373426.

The spelling of 289687 in words is "two hundred eighty-nine thousand, six hundred eighty-seven".