135423 has 12 divisors (see below), whose sum is σ = 200928. Its totient is φ = 87840.

The previous prime is 135409. The next prime is 135427. The reversal of 135423 is 324531.

It is a Cunningham number, because it is equal to 368²-1.

It is not a de Polignac number, because 135423 - 2⁵ = 135391 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135396 and 135405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 186 + ... + 552.

It is an arithmetic number, because the mean of its divisors is an integer number (16744).

2¹³⁵⁴²³ is an apocalyptic number.

135423 is a deficient number, since it is larger than the sum of its proper divisors (65505).

135423 is a wasteful number, since it uses less digits than its factorization.

135423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 411 counting only the distinct ones).

The product of its digits is 360, while the sum is 18.

The square root of 135423 is about 367.9986413018. The cubic root of 135423 is about 51.3528017833.

Adding to 135423 its reverse (324531), we get a palindrome (459954).

The spelling of 135423 in words is "one hundred thirty-five thousand, four hundred twenty-three".