138364469 has 2 divisors, whose sum is σ = 138364470. Its totient is φ = 138364468.

The previous prime is 138364433. The next prime is 138364493. The reversal of 138364469 is 964463831.

138364469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121660900 + 16703569 = 11030^2 + 4087^2 .

It is an emirp because it is prime and its reverse (964463831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138364469 - 2¹² = 138360373 is a prime.

It is a super-3 number, since 3×138364469³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138364069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69182234 + 69182235.

It is an arithmetic number, because the mean of its divisors is an integer number (69182235).

Almost surely, 2^138364469 is an apocalyptic number.

It is an amenable number.

138364469 is a deficient number, since it is larger than the sum of its proper divisors (1).

138364469 is an equidigital number, since it uses as much as digits as its factorization.

138364469 is an evil number, because the sum of its binary digits is even.

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

The square root of 138364469 is about 11762.8427261441. The cubic root of 138364469 is about 517.2194644325.

The spelling of 138364469 in words is "one hundred thirty-eight million, three hundred sixty-four thousand, four hundred sixty-nine".