138344669 has 2 divisors, whose sum is σ = 138344670. Its totient is φ = 138344668.

The previous prime is 138344639. The next prime is 138344671. The reversal of 138344669 is 966443831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138344644 + 25 = 11762^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 138344669 - 2¹⁶ = 138279133 is a prime.

It is a super-2 number, since 2×138344669² = 38278494881439122, which contains 22 as substring.

Together with 138344671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138344639) 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, 69172334 + 69172335.

It is an arithmetic number, because the mean of its divisors is an integer number (69172335).

Almost surely, 2^138344669 is an apocalyptic number.

It is an amenable number.

138344669 is a deficient number, since it is larger than the sum of its proper divisors (1).

138344669 is an equidigital number, since it uses as much as digits as its factorization.

138344669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 44.

The square root of 138344669 is about 11762.0010627444. The cubic root of 138344669 is about 517.1947918317.

The spelling of 138344669 in words is "one hundred thirty-eight million, three hundred forty-four thousand, six hundred sixty-nine".