135444 has 12 divisors (see below), whose sum is σ = 316064. Its totient is φ = 45144.

The previous prime is 135433. The next prime is 135449. The reversal of 135444 is 444531.

135444 = T₁₈₀ + T₁₈₁ + ... + T₁₈₇.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 135444.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 135444.

It is not an unprimeable number, because it can be changed into a prime (135449) by changing a digit.

135444 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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5632 + ... + 5655.

2¹³⁵⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

135444 is an abundant number, since it is smaller than the sum of its proper divisors (180620).

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

135444 is a wasteful number, since it uses less digits than its factorization.

135444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11294 (or 11292 counting only the distinct ones).

The product of its digits is 960, while the sum is 21.

The square root of 135444 is about 368.0271729098. The cubic root of 135444 is about 51.3554560668.

Adding to 135444 its reverse (444531), we get a palindrome (579975).

The spelling of 135444 in words is "one hundred thirty-five thousand, four hundred forty-four".