135805729 has 4 divisors (see below), whose sum is σ = 135917460. Its totient is φ = 135694000.

The previous prime is 135805721. The next prime is 135805763. The reversal of 135805729 is 927508531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127238400 + 8567329 = 11280^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 135805729 - 2³ = 135805721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135805691 and 135805700.

It is not an unprimeable number, because it can be changed into a prime (135805721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54022 + ... + 56479.

It is an arithmetic number, because the mean of its divisors is an integer number (33979365).

Almost surely, 2^135805729 is an apocalyptic number.

It is an amenable number.

135805729 is a deficient number, since it is larger than the sum of its proper divisors (111731).

135805729 is a wasteful number, since it uses less digits than its factorization.

135805729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111730.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 135805729 is about 11653.5715126308. The cubic root of 135805729 is about 514.0113360306.

The spelling of 135805729 in words is "one hundred thirty-five million, eight hundred five thousand, seven hundred twenty-nine".