138465469 has 2 divisors, whose sum is σ = 138465470. Its totient is φ = 138465468.

The previous prime is 138465443. The next prime is 138465479. The reversal of 138465469 is 964564831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78092569 + 60372900 = 8837^2 + 7770^2 .

It is an emirp because it is prime and its reverse (964564831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138465469 - 2¹¹ = 138463421 is a prime.

It is a super-2 number, since 2×138465469² = 38345372210779922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138465419) 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, 69232734 + 69232735.

It is an arithmetic number, because the mean of its divisors is an integer number (69232735).

Almost surely, 2^138465469 is an apocalyptic number.

It is an amenable number.

138465469 is a deficient number, since it is larger than the sum of its proper divisors (1).

138465469 is an equidigital number, since it uses as much as digits as its factorization.

138465469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 46.

The square root of 138465469 is about 11767.1351228751. The cubic root of 138465469 is about 517.3452830059.

The spelling of 138465469 in words is "one hundred thirty-eight million, four hundred sixty-five thousand, four hundred sixty-nine".