138734389 has 2 divisors, whose sum is σ = 138734390. Its totient is φ = 138734388.

The previous prime is 138734377. The next prime is 138734461. The reversal of 138734389 is 983437831.

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., 83722500 + 55011889 = 9150^2 + 7417^2 .

It is a cyclic number.

It is not a de Polignac number, because 138734389 - 2¹³ = 138726197 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 (138734339) 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, 69367194 + 69367195.

It is an arithmetic number, because the mean of its divisors is an integer number (69367195).

Almost surely, 2^138734389 is an apocalyptic number.

It is an amenable number.

138734389 is a deficient number, since it is larger than the sum of its proper divisors (1).

138734389 is an equidigital number, since it uses as much as digits as its factorization.

138734389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 46.

The square root of 138734389 is about 11778.5563207042. The cubic root of 138734389 is about 517.6799862473.

The spelling of 138734389 in words is "one hundred thirty-eight million, seven hundred thirty-four thousand, three hundred eighty-nine".