86999 has 6 divisors (see below), whose sum is σ = 95760. Its totient is φ = 78980.

The previous prime is 86993. The next prime is 87011. The reversal of 86999 is 99968.

It is not a de Polignac number, because 86999 - 2⁸ = 86743 is a prime.

It is a Duffinian number.

86999 is a modest number, since divided by 999 gives 86 as remainder.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 86999.

It is not an unprimeable number, because it can be changed into a prime (86993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 239 + ... + 480.

It is an arithmetic number, because the mean of its divisors is an integer number (15960).

2⁸⁶⁹⁹⁹ is an apocalyptic number.

86999 is a deficient number, since it is larger than the sum of its proper divisors (8761).

86999 is a wasteful number, since it uses less digits than its factorization.

86999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741 (or 730 counting only the distinct ones).

The product of its digits is 34992, while the sum is 41.

The square root of 86999 is about 294.9559289114. The cubic root of 86999 is about 44.3103064443.

It can be divided in two parts, 8 and 6999, that added together give a palindrome (7007).

The spelling of 86999 in words is "eighty-six thousand, nine hundred ninety-nine".