135699923 has 4 divisors (see below), whose sum is σ = 136002600. Its totient is φ = 135397248.

The previous prime is 135699917. The next prime is 135699943. The reversal of 135699923 is 329996531.

135699923 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329996531 = 907 ⋅363833.

It is a cyclic number.

It is not a de Polignac number, because 135699923 - 2²⁶ = 68591059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135699943) 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, 150665 + ... + 151562.

It is an arithmetic number, because the mean of its divisors is an integer number (34000650).

Almost surely, 2^135699923 is an apocalyptic number.

135699923 is a deficient number, since it is larger than the sum of its proper divisors (302677).

135699923 is an equidigital number, since it uses as much as digits as its factorization.

135699923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302676.

The product of its digits is 393660, while the sum is 47.

The square root of 135699923 is about 11649.0309897433. The cubic root of 135699923 is about 513.8778129119.

The spelling of 135699923 in words is "one hundred thirty-five million, six hundred ninety-nine thousand, nine hundred twenty-three".