136686 has 32 divisors (see below), whose sum is σ = 316800. Its totient is φ = 38880.

The previous prime is 136657. The next prime is 136691. The reversal of 136686 is 686631.

136686 is nontrivially palindromic in base 13.

Its product of digits (5184) is a multiple of the sum of its prime divisors (144).

It is a congruent number.

It is an unprimeable number.

136686 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1200 + ... + 1308.

It is an arithmetic number, because the mean of its divisors is an integer number (9900).

2¹³⁶⁶⁸⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 136686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158400).

136686 is an abundant number, since it is smaller than the sum of its proper divisors (180114).

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

136686 is a wasteful number, since it uses less digits than its factorization.

136686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144.

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

The square root of 136686 is about 369.7106977084. The cubic root of 136686 is about 51.5119524839.

Subtracting 136686 from its reverse (686631), we obtain a palindrome (549945).

The spelling of 136686 in words is "one hundred thirty-six thousand, six hundred eighty-six".