135769439 has 4 divisors (see below), whose sum is σ = 146213256. Its totient is φ = 125325624.

The previous prime is 135769433. The next prime is 135769441. The reversal of 135769439 is 934967531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 934967531 = 1361 ⋅686971.

It is a cyclic number.

It is not a de Polignac number, because 135769439 - 2⁴ = 135769423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 135769393 and 135769402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135769433) 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, 5221889 + ... + 5221914.

It is an arithmetic number, because the mean of its divisors is an integer number (36553314).

Almost surely, 2^135769439 is an apocalyptic number.

135769439 is a deficient number, since it is larger than the sum of its proper divisors (10443817).

135769439 is a wasteful number, since it uses less digits than its factorization.

135769439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10443816.

The product of its digits is 612360, while the sum is 47.

The square root of 135769439 is about 11652.0143752057. The cubic root of 135769439 is about 513.9655472575.

The spelling of 135769439 in words is "one hundred thirty-five million, seven hundred sixty-nine thousand, four hundred thirty-nine".