289887 has 8 divisors (see below), whose sum is σ = 416304. Its totient is φ = 178368.

The previous prime is 289871. The next prime is 289889. The reversal of 289887 is 788982.

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 289887 - 2⁴ = 289871 is a prime.

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 289887.

It is not an unprimeable number, because it can be changed into a prime (289889) 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, 3678 + ... + 3755.

It is an arithmetic number, because the mean of its divisors is an integer number (52038).

2²⁸⁹⁸⁸⁷ is an apocalyptic number.

289887 is a deficient number, since it is larger than the sum of its proper divisors (126417).

289887 is a wasteful number, since it uses less digits than its factorization.

289887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7449.

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

The square root of 289887 is about 538.4115526249. The cubic root of 289887 is about 66.1824611338.

It can be divided in two parts, 289 and 887, that added together give a triangular number (1176 = T₄₈).

The spelling of 289887 in words is "two hundred eighty-nine thousand, eight hundred eighty-seven".