287239 has 2 divisors, whose sum is σ = 287240. Its totient is φ = 287238.

The previous prime is 287237. The next prime is 287251. The reversal of 287239 is 932782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 287239 - 2¹ = 287237 is a prime.

Together with 287237, it forms a pair of twin primes.

It is a Chen prime.

287239 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 287239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287233) 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 as a sum of consecutive naturals, namely, 143619 + 143620.

It is an arithmetic number, because the mean of its divisors is an integer number (143620).

2²⁸⁷²³⁹ is an apocalyptic number.

287239 is a deficient number, since it is larger than the sum of its proper divisors (1).

287239 is an equidigital number, since it uses as much as digits as its factorization.

287239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 287239 is about 535.9468257206. The cubic root of 287239 is about 65.9803277764.

The spelling of 287239 in words is "two hundred eighty-seven thousand, two hundred thirty-nine".