135442 has 8 divisors (see below), whose sum is σ = 204732. Its totient is φ = 67200.

The previous prime is 135433. The next prime is 135449. The reversal of 135442 is 244531.

135442 is nontrivially palindromic in base 4 and base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 128881 + 6561 = 359^2 + 81^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

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

135442 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, 342 + ... + 622.

2¹³⁵⁴⁴² is an apocalyptic number.

135442 is a deficient number, since it is larger than the sum of its proper divisors (69290).

135442 is a wasteful number, since it uses less digits than its factorization.

135442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 480, while the sum is 19.

The square root of 135442 is about 368.0244557091. The cubic root of 135442 is about 51.3552032897.

Adding to 135442 its reverse (244531), we get a palindrome (379973).

The spelling of 135442 in words is "one hundred thirty-five thousand, four hundred forty-two".