138068789 has 2 divisors, whose sum is σ = 138068790. Its totient is φ = 138068788.

The previous prime is 138068779. The next prime is 138068837. The reversal of 138068789 is 987860831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94284100 + 43784689 = 9710^2 + 6617^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138068789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138068779) 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, 69034394 + 69034395.

It is an arithmetic number, because the mean of its divisors is an integer number (69034395).

Almost surely, 2^138068789 is an apocalyptic number.

It is an amenable number.

138068789 is a deficient number, since it is larger than the sum of its proper divisors (1).

138068789 is an equidigital number, since it uses as much as digits as its factorization.

138068789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 138068789 is about 11750.2676139737. The cubic root of 138068789 is about 516.8507750856.

The spelling of 138068789 in words is "one hundred thirty-eight million, sixty-eight thousand, seven hundred eighty-nine".