135808 has 16 divisors (see below), whose sum is σ = 270810. Its totient is φ = 67840.

The previous prime is 135799. The next prime is 135829. The reversal of 135808 is 808531.

It can be written as a sum of positive squares in only one way, i.e., 107584 + 28224 = 328^2 + 168^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403 + ... + 658.

2¹³⁵⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

135808 is a deficient number, since it is larger than the sum of its proper divisors (135002).

135808 is an equidigital number, since it uses as much as digits as its factorization.

135808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 135808 is about 368.5213698010. The cubic root of 135808 is about 51.4014201185.

The spelling of 135808 in words is "one hundred thirty-five thousand, eight hundred eight".