86809 has 4 divisors (see below), whose sum is σ = 88704. Its totient is φ = 84916.

The previous prime is 86783. The next prime is 86813. The reversal of 86809 is 90868.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86809 - 2⁹ = 86297 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86869) 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, 877 + ... + 970.

It is an arithmetic number, because the mean of its divisors is an integer number (22176).

2⁸⁶⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

86809 is a deficient number, since it is larger than the sum of its proper divisors (1895).

86809 is a wasteful number, since it uses less digits than its factorization.

86809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 86809 is about 294.6336708525. The cubic root of 86809 is about 44.2780260178.

The spelling of 86809 in words is "eighty-six thousand, eight hundred nine".