86439 has 4 divisors (see below), whose sum is σ = 115256. Its totient is φ = 57624.

The previous prime is 86423. The next prime is 86441. The reversal of 86439 is 93468.

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

It is not a de Polignac number, because 86439 - 2⁴ = 86423 is a prime.

It is a D-number.

It is a Duffinian number.

86439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86239) 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, 14404 + ... + 14409.

It is an arithmetic number, because the mean of its divisors is an integer number (28814).

2⁸⁶⁴³⁹ is an apocalyptic number.

86439 is a deficient number, since it is larger than the sum of its proper divisors (28817).

86439 is a wasteful number, since it uses less digits than its factorization.

86439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28816.

The product of its digits is 5184, while the sum is 30.

The square root of 86439 is about 294.0051019965. The cubic root of 86439 is about 44.2150287066.

It can be divided in two parts, 864 and 39, that added together give a triangular number (903 = T₄₂).

The spelling of 86439 in words is "eighty-six thousand, four hundred thirty-nine".