135688423 has 4 divisors (see below), whose sum is σ = 146126008. Its totient is φ = 125250840.

The previous prime is 135688411. The next prime is 135688429. The reversal of 135688423 is 324886531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324886531 = 1471 ⋅220861.

It is not a de Polignac number, because 135688423 - 2⁵ = 135688391 is a prime.

It is a super-2 number, since 2×135688423² = 36822696272453858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135688429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5218773 + ... + 5218798.

It is an arithmetic number, because the mean of its divisors is an integer number (36531502).

Almost surely, 2^135688423 is an apocalyptic number.

135688423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

135688423 is a deficient number, since it is larger than the sum of its proper divisors (10437585).

135688423 is a wasteful number, since it uses less digits than its factorization.

135688423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10437584.

The product of its digits is 138240, while the sum is 40.

The square root of 135688423 is about 11648.5373759970. The cubic root of 135688423 is about 513.8632961712.

The spelling of 135688423 in words is "one hundred thirty-five million, six hundred eighty-eight thousand, four hundred twenty-three".