289087 has 4 divisors (see below), whose sum is σ = 301680. Its totient is φ = 276496.

The previous prime is 289067. The next prime is 289099. The reversal of 289087 is 780982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780982 = 2 ⋅390491.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-289087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289067) 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, 6262 + ... + 6307.

It is an arithmetic number, because the mean of its divisors is an integer number (75420).

2²⁸⁹⁰⁸⁷ is an apocalyptic number.

289087 is a deficient number, since it is larger than the sum of its proper divisors (12593).

289087 is a wasteful number, since it uses less digits than its factorization.

289087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12592.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 289087 is about 537.6681132446. The cubic root of 289087 is about 66.1215238851.

The spelling of 289087 in words is "two hundred eighty-nine thousand, eighty-seven".