138510009 has 24 divisors (see below), whose sum is σ = 223340832. Its totient is φ = 81990720.

The previous prime is 138510007. The next prime is 138510017. The reversal of 138510009 is 900015831.

138510009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138510009 - 2¹ = 138510007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138510007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12012 + ... + 20525.

It is an arithmetic number, because the mean of its divisors is an integer number (9305868).

Almost surely, 2^138510009 is an apocalyptic number.

It is an amenable number.

138510009 is a deficient number, since it is larger than the sum of its proper divisors (84830823).

138510009 is a wasteful number, since it uses less digits than its factorization.

138510009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32597 (or 32594 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 138510009 is about 11769.0275299194. The cubic root of 138510009 is about 517.4007483115.

The spelling of 138510009 in words is "one hundred thirty-eight million, five hundred ten thousand, nine".