138039793 has 2 divisors, whose sum is σ = 138039794. Its totient is φ = 138039792.

The previous prime is 138039773. The next prime is 138039817. The reversal of 138039793 is 397930831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82864609 + 55175184 = 9103^2 + 7428^2 .

It is a cyclic number.

It is not a de Polignac number, because 138039793 - 2⁹ = 138039281 is a prime.

It is not a weakly prime, because it can be changed into another prime (138039773) 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 as a sum of consecutive naturals, namely, 69019896 + 69019897.

It is an arithmetic number, because the mean of its divisors is an integer number (69019897).

Almost surely, 2^138039793 is an apocalyptic number.

It is an amenable number.

138039793 is a deficient number, since it is larger than the sum of its proper divisors (1).

138039793 is an equidigital number, since it uses as much as digits as its factorization.

138039793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 138039793 is about 11749.0337049478. The cubic root of 138039793 is about 516.8145910587.

The spelling of 138039793 in words is "one hundred thirty-eight million, thirty-nine thousand, seven hundred ninety-three".