138375673 has 2 divisors, whose sum is σ = 138375674. Its totient is φ = 138375672.

The previous prime is 138375649. The next prime is 138375683. The reversal of 138375673 is 376573831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107495424 + 30880249 = 10368^2 + 5557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138375673 is a prime.

It is not a weakly prime, because it can be changed into another prime (138375623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69187836 + 69187837.

It is an arithmetic number, because the mean of its divisors is an integer number (69187837).

Almost surely, 2^138375673 is an apocalyptic number.

It is an amenable number.

138375673 is a deficient number, since it is larger than the sum of its proper divisors (1).

138375673 is an equidigital number, since it uses as much as digits as its factorization.

138375673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The square root of 138375673 is about 11763.3189619257. The cubic root of 138375673 is about 517.2334245927.

The spelling of 138375673 in words is "one hundred thirty-eight million, three hundred seventy-five thousand, six hundred seventy-three".