135809943 has 16 divisors (see below), whose sum is σ = 186310656. Its totient is φ = 87933600.

The previous prime is 135809897. The next prime is 135809951. The reversal of 135809943 is 349908531.

It is not a de Polignac number, because 135809943 - 2⁶ = 135809879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135809895 and 135809904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135809983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117418 + ... + 118568.

It is an arithmetic number, because the mean of its divisors is an integer number (11644416).

Almost surely, 2^135809943 is an apocalyptic number.

135809943 is a deficient number, since it is larger than the sum of its proper divisors (50500713).

135809943 is a wasteful number, since it uses less digits than its factorization.

135809943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 135809943 is about 11653.7523141690. The cubic root of 135809943 is about 514.0166525009.

The spelling of 135809943 in words is "one hundred thirty-five million, eight hundred nine thousand, nine hundred forty-three".