138186517 has 12 divisors (see below), whose sum is σ = 161121216. Its totient is φ = 118170360.

The previous prime is 138186509. The next prime is 138186547. The reversal of 138186517 is 715681831.

It is not a de Polignac number, because 138186517 - 2³ = 138186509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138186517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138186547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19642 + ... + 25732.

It is an arithmetic number, because the mean of its divisors is an integer number (13426768).

Almost surely, 2^138186517 is an apocalyptic number.

It is an amenable number.

138186517 is a deficient number, since it is larger than the sum of its proper divisors (22934699).

138186517 is an equidigital number, since it uses as much as digits as its factorization.

138186517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6568 (or 6561 counting only the distinct ones).

The product of its digits is 40320, while the sum is 40.

The square root of 138186517 is about 11755.2761345704. The cubic root of 138186517 is about 516.9976355073.

The spelling of 138186517 in words is "one hundred thirty-eight million, one hundred eighty-six thousand, five hundred seventeen".