135889 has 4 divisors (see below), whose sum is σ = 146356. Its totient is φ = 125424.

The previous prime is 135887. The next prime is 135893. The reversal of 135889 is 988531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988531 = 593 ⋅1667.

It can be written as a sum of positive squares in 2 ways, for example, as 85264 + 50625 = 292^2 + 225^2 .

It is not a de Polignac number, because 135889 - 2¹ = 135887 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135887) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5214 + ... + 5239.

It is an arithmetic number, because the mean of its divisors is an integer number (36589).

2¹³⁵⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

135889 is a deficient number, since it is larger than the sum of its proper divisors (10467).

135889 is a wasteful number, since it uses less digits than its factorization.

135889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10466.

The product of its digits is 8640, while the sum is 34.

The square root of 135889 is about 368.6312520663. The cubic root of 135889 is about 51.4116372082.

It can be divided in two parts, 135 and 889, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 135889 in words is "one hundred thirty-five thousand, eight hundred eighty-nine".