133686 has 24 divisors (see below), whose sum is σ = 331344. Its totient is φ = 38160.

The previous prime is 133673. The next prime is 133691. The reversal of 133686 is 686331.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405 + ... + 656.

It is an arithmetic number, because the mean of its divisors is an integer number (13806).

2¹³³⁶⁸⁶ is an apocalyptic number.

133686 is an abundant number, since it is smaller than the sum of its proper divisors (197658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133686 is a wasteful number, since it uses less digits than its factorization.

133686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1073 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 133686 is about 365.6309614899. The cubic root of 133686 is about 51.1322978047.

It can be divided in two parts, 13368 and 6, that multiplied together give a palindrome (80208).

The spelling of 133686 in words is "one hundred thirty-three thousand, six hundred eighty-six".