138838169 has 2 divisors, whose sum is σ = 138838170. Its totient is φ = 138838168.

The previous prime is 138838127. The next prime is 138838213. The reversal of 138838169 is 961838831.

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., 134258569 + 4579600 = 11587^2 + 2140^2 .

It is an emirp because it is prime and its reverse (961838831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138838169 - 2¹⁶ = 138772633 is a prime.

It is a super-2 number, since 2×138838169² = 38552074342545122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (138838069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69419084 + 69419085.

It is an arithmetic number, because the mean of its divisors is an integer number (69419085).

Almost surely, 2^138838169 is an apocalyptic number.

It is an amenable number.

138838169 is a deficient number, since it is larger than the sum of its proper divisors (1).

138838169 is an equidigital number, since it uses as much as digits as its factorization.

138838169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 138838169 is about 11782.9609606414. The cubic root of 138838169 is about 517.8090372555.

The spelling of 138838169 in words is "one hundred thirty-eight million, eight hundred thirty-eight thousand, one hundred sixty-nine".