287839 has 4 divisors (see below), whose sum is σ = 291856. Its totient is φ = 283824.

The previous prime is 287821. The next prime is 287849. The reversal of 287839 is 938782.

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

It is not a de Polignac number, because 287839 - 2⁹ = 287327 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 287798 and 287807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (287849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1899 + ... + 2044.

It is an arithmetic number, because the mean of its divisors is an integer number (72964).

2²⁸⁷⁸³⁹ is an apocalyptic number.

287839 is a deficient number, since it is larger than the sum of its proper divisors (4017).

287839 is an equidigital number, since it uses as much as digits as its factorization.

287839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016.

The product of its digits is 24192, while the sum is 37.

The square root of 287839 is about 536.5062907367. The cubic root of 287839 is about 66.0262368904.

The spelling of 287839 in words is "two hundred eighty-seven thousand, eight hundred thirty-nine".