85439 has 2 divisors, whose sum is σ = 85440. Its totient is φ = 85438.

The previous prime is 85429. The next prime is 85447. The reversal of 85439 is 93458.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85439 - 2¹² = 81343 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 8 + 5⁷ + 4² + 3⁸ + 9³ .

It is a plaindrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42719 + 42720.

It is an arithmetic number, because the mean of its divisors is an integer number (42720).

2⁸⁵⁴³⁹ is an apocalyptic number.

85439 is a deficient number, since it is larger than the sum of its proper divisors (1).

85439 is an equidigital number, since it uses as much as digits as its factorization.

85439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 85439 is about 292.2995039339. The cubic root of 85439 is about 44.0438612213.

The spelling of 85439 in words is "eighty-five thousand, four hundred thirty-nine".