138743873 has 8 divisors (see below), whose sum is σ = 141681288. Its totient is φ = 135834624.

The previous prime is 138743867. The next prime is 138743893. The reversal of 138743873 is 378347831.

It can be written as a sum of positive squares in 4 ways, for example, as 26553409 + 112190464 = 5153^2 + 10592^2 .

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 138743873 - 2²⁰ = 137695297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138743893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3065 + ... + 16937.

It is an arithmetic number, because the mean of its divisors is an integer number (17710161).

Almost surely, 2^138743873 is an apocalyptic number.

It is an amenable number.

138743873 is a deficient number, since it is larger than the sum of its proper divisors (2937415).

138743873 is a wasteful number, since it uses less digits than its factorization.

138743873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14083.

The product of its digits is 338688, while the sum is 44.

The square root of 138743873 is about 11778.9589098528. The cubic root of 138743873 is about 517.6917823256.

The spelling of 138743873 in words is "one hundred thirty-eight million, seven hundred forty-three thousand, eight hundred seventy-three".