287889 has 8 divisors (see below), whose sum is σ = 438720. Its totient is φ = 164496.

The previous prime is 287887. The next prime is 287921. The reversal of 287889 is 988782.

It is a happy number.

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

It is not a de Polignac number, because 287889 - 2¹ = 287887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 287889.

It is not an unprimeable number, because it can be changed into a prime (287887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6834 + ... + 6875.

It is an arithmetic number, because the mean of its divisors is an integer number (54840).

2²⁸⁷⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

287889 is a deficient number, since it is larger than the sum of its proper divisors (150831).

287889 is a wasteful number, since it uses less digits than its factorization.

287889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13719.

The product of its digits is 64512, while the sum is 42.

The square root of 287889 is about 536.5528864893. The cubic root of 287889 is about 66.0300597691.

It can be divided in two parts, 287 and 889, that added together give a triangular number (1176 = T₄₈).

The spelling of 287889 in words is "two hundred eighty-seven thousand, eight hundred eighty-nine".