86909 has 4 divisors (see below), whose sum is σ = 87516. Its totient is φ = 86304.

The previous prime is 86869. The next prime is 86923. The reversal of 86909 is 90968.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 31684 + 55225 = 178^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 86909 - 2¹² = 82813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86929) 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 3 ways as a sum of consecutive naturals, for example, 47 + ... + 419.

It is an arithmetic number, because the mean of its divisors is an integer number (21879).

2⁸⁶⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

86909 is a deficient number, since it is larger than the sum of its proper divisors (607).

86909 is a wasteful number, since it uses less digits than its factorization.

86909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 86909 is about 294.8033242689. The cubic root of 86909 is about 44.2950215808.

It can be divided in two parts, 8690 and 9, that multiplied together give a triangular number (78210 = T₃₉₅).

The spelling of 86909 in words is "eighty-six thousand, nine hundred nine".