138765517 has 12 divisors (see below), whose sum is σ = 156433248. Its totient is φ = 122071800.

The previous prime is 138765457. The next prime is 138765521. The reversal of 138765517 is 715567831.

It is a de Polignac number, because none of the positive numbers 2^k-138765517 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 (138765547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4008 + ... + 17134.

It is an arithmetic number, because the mean of its divisors is an integer number (13036104).

Almost surely, 2^138765517 is an apocalyptic number.

It is an amenable number.

138765517 is a deficient number, since it is larger than the sum of its proper divisors (17667731).

138765517 is a wasteful number, since it uses less digits than its factorization.

138765517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13200 (or 13169 counting only the distinct ones).

The product of its digits is 176400, while the sum is 43.

The square root of 138765517 is about 11779.8776309434. The cubic root of 138765517 is about 517.7187008436.

The spelling of 138765517 in words is "one hundred thirty-eight million, seven hundred sixty-five thousand, five hundred seventeen".