138080639 has 2 divisors, whose sum is σ = 138080640. Its totient is φ = 138080638.

The previous prime is 138080627. The next prime is 138080651. The reversal of 138080639 is 936080831.

It is a balanced prime because it is at equal distance from previous prime (138080627) and next prime (138080651).

It is a cyclic number.

It is not a de Polignac number, because 138080639 - 2¹⁶ = 138015103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138080699) 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, 69040319 + 69040320.

It is an arithmetic number, because the mean of its divisors is an integer number (69040320).

Almost surely, 2^138080639 is an apocalyptic number.

138080639 is a deficient number, since it is larger than the sum of its proper divisors (1).

138080639 is an equidigital number, since it uses as much as digits as its factorization.

138080639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 138080639 is about 11750.7718469895. The cubic root of 138080639 is about 516.8655612090.

The spelling of 138080639 in words is "one hundred thirty-eight million, eighty thousand, six hundred thirty-nine".