135787989 has 8 divisors (see below), whose sum is σ = 181209952. Its totient is φ = 90445680.

The previous prime is 135787987. The next prime is 135788017. The reversal of 135787989 is 989787531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135787989 - 2¹ = 135787987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135787987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15814 + ... + 22839.

It is an arithmetic number, because the mean of its divisors is an integer number (22651244).

Almost surely, 2^135787989 is an apocalyptic number.

It is an amenable number.

135787989 is a deficient number, since it is larger than the sum of its proper divisors (45421963).

135787989 is a wasteful number, since it uses less digits than its factorization.

135787989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39827.

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

The square root of 135787989 is about 11652.8103477230. The cubic root of 135787989 is about 513.9889536706.

The spelling of 135787989 in words is "one hundred thirty-five million, seven hundred eighty-seven thousand, nine hundred eighty-nine".