285839 has 2 divisors, whose sum is σ = 285840. Its totient is φ = 285838.

The previous prime is 285827. The next prime is 285841. The reversal of 285839 is 938582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285839 - 2⁴ = 285823 is a prime.

It is a Sophie Germain prime.

Together with 285841, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2¹⁴ + 8⁴ + 8⁶ + 5⁵ + 3⁴ + 9 .

It is a junction number, because it is equal to n+sod(n) for n = 285799 and 285808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142919 + 142920.

It is an arithmetic number, because the mean of its divisors is an integer number (142920).

2²⁸⁵⁸³⁹ is an apocalyptic number.

285839 is a deficient number, since it is larger than the sum of its proper divisors (1).

285839 is an equidigital number, since it uses as much as digits as its factorization.

285839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 285839 is about 534.6391306292. The cubic root of 285839 is about 65.8729573280.

The spelling of 285839 in words is "two hundred eighty-five thousand, eight hundred thirty-nine".