135439 has 8 divisors (see below), whose sum is σ = 148608. Its totient is φ = 122880.

The previous prime is 135433. The next prime is 135449. The reversal of 135439 is 934531.

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

It is a cyclic number.

It is not a de Polignac number, because 135439 - 2³ = 135431 is a prime.

It is a Duffinian number.

135439 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135431) 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 7 ways as a sum of consecutive naturals, for example, 399 + ... + 655.

It is an arithmetic number, because the mean of its divisors is an integer number (18576).

2¹³⁵⁴³⁹ is an apocalyptic number.

135439 is a deficient number, since it is larger than the sum of its proper divisors (13169).

135439 is a wasteful number, since it uses less digits than its factorization.

135439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305.

The product of its digits is 1620, while the sum is 25.

The square root of 135439 is about 368.0203798705. The cubic root of 135439 is about 51.3548241194.

It can be divided in two parts, 13 and 5439, that multiplied together give a palindrome (70707).

The spelling of 135439 in words is "one hundred thirty-five thousand, four hundred thirty-nine".