135878 has 4 divisors (see below), whose sum is σ = 203820. Its totient is φ = 67938.

The previous prime is 135859. The next prime is 135887. The reversal of 135878 is 878531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 878531 = 23 ⋅38197.

It is a congruent number.

It is an unprimeable number.

135878 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 33968 + ... + 33971.

It is an arithmetic number, because the mean of its divisors is an integer number (50955).

2¹³⁵⁸⁷⁸ is an apocalyptic number.

135878 is a deficient number, since it is larger than the sum of its proper divisors (67942).

135878 is an equidigital number, since it uses as much as digits as its factorization.

135878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67941.

The product of its digits is 6720, while the sum is 32.

The square root of 135878 is about 368.6163317055. The cubic root of 135878 is about 51.4102499405.

The spelling of 135878 in words is "one hundred thirty-five thousand, eight hundred seventy-eight".