135639 has 12 divisors (see below), whose sum is σ = 224016. Its totient is φ = 77472.

The previous prime is 135637. The next prime is 135647. The reversal of 135639 is 936531.

135639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135639 - 2¹ = 135637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1014 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (18668).

2¹³⁵⁶³⁹ is an apocalyptic number.

135639 is a deficient number, since it is larger than the sum of its proper divisors (88377).

135639 is a wasteful number, since it uses less digits than its factorization.

135639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166 (or 2163 counting only the distinct ones).

The product of its digits is 2430, while the sum is 27.

The square root of 135639 is about 368.2920037144. The cubic root of 135639 is about 51.3800898930.

The spelling of 135639 in words is "one hundred thirty-five thousand, six hundred thirty-nine".