135899787 has 4 divisors (see below), whose sum is σ = 181199720. Its totient is φ = 90599856.

The previous prime is 135899773. The next prime is 135899807. The reversal of 135899787 is 787998531.

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

It is not a de Polignac number, because 135899787 - 2¹⁴ = 135883403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135899087) 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, 22649962 + ... + 22649967.

It is an arithmetic number, because the mean of its divisors is an integer number (45299930).

Almost surely, 2^135899787 is an apocalyptic number.

135899787 is a deficient number, since it is larger than the sum of its proper divisors (45299933).

135899787 is an equidigital number, since it uses as much as digits as its factorization.

135899787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45299932.

The product of its digits is 3810240, while the sum is 57.

The square root of 135899787 is about 11657.6064009727. The cubic root of 135899787 is about 514.1299754070.

The spelling of 135899787 in words is "one hundred thirty-five million, eight hundred ninety-nine thousand, seven hundred eighty-seven".