138722517 has 8 divisors (see below), whose sum is σ = 205514880. Its totient is φ = 92481660.

The previous prime is 138722503. The next prime is 138722527. The reversal of 138722517 is 715227831.

138722517 is a `hidden beast` number, since 138 + 7 + 2 + 2 + 517 = 666.

It is not a de Polignac number, because 138722517 - 2¹⁰ = 138721493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138722527) 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 7 ways as a sum of consecutive naturals, for example, 2568909 + ... + 2568962.

It is an arithmetic number, because the mean of its divisors is an integer number (25689360).

Almost surely, 2^138722517 is an apocalyptic number.

It is an amenable number.

138722517 is a deficient number, since it is larger than the sum of its proper divisors (66792363).

138722517 is an equidigital number, since it uses as much as digits as its factorization.

138722517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5137880 (or 5137874 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 138722517 is about 11778.0523432357. The cubic root of 138722517 is about 517.6652192475.

The spelling of 138722517 in words is "one hundred thirty-eight million, seven hundred twenty-two thousand, five hundred seventeen".