138366517 has 8 divisors (see below), whose sum is σ = 141212160. Its totient is φ = 135529680.

The previous prime is 138366497. The next prime is 138366521. The reversal of 138366517 is 715663831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138366517 - 2¹¹ = 138364469 is a prime.

It is a super-2 number, since 2×138366517² = 38290586053422578, which contains 22 as substring.

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 138366517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138360517) 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, 36292 + ... + 39922.

It is an arithmetic number, because the mean of its divisors is an integer number (17651520).

Almost surely, 2^138366517 is an apocalyptic number.

It is an amenable number.

138366517 is a deficient number, since it is larger than the sum of its proper divisors (2845643).

138366517 is an equidigital number, since it uses as much as digits as its factorization.

138366517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403.

The product of its digits is 90720, while the sum is 40.

The square root of 138366517 is about 11762.9297796085. The cubic root of 138366517 is about 517.2220162924. Note that the first 3 decimals are identical.

The spelling of 138366517 in words is "one hundred thirty-eight million, three hundred sixty-six thousand, five hundred seventeen".