138732739 has 2 divisors, whose sum is σ = 138732740. Its totient is φ = 138732738.

The previous prime is 138732731. The next prime is 138732743. The reversal of 138732739 is 937237831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138732739 - 2³ = 138732731 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138732695 and 138732704.

It is not a weakly prime, because it can be changed into another prime (138732731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69366369 + 69366370.

It is an arithmetic number, because the mean of its divisors is an integer number (69366370).

Almost surely, 2^138732739 is an apocalyptic number.

138732739 is a deficient number, since it is larger than the sum of its proper divisors (1).

138732739 is an equidigital number, since it uses as much as digits as its factorization.

138732739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 43.

The square root of 138732739 is about 11778.4862779561. The cubic root of 138732739 is about 517.6779339435.

The spelling of 138732739 in words is "one hundred thirty-eight million, seven hundred thirty-two thousand, seven hundred thirty-nine".