138338293 has 2 divisors, whose sum is σ = 138338294. Its totient is φ = 138338292.

The previous prime is 138338287. The next prime is 138338309. The reversal of 138338293 is 392833831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136258929 + 2079364 = 11673^2 + 1442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138338293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138338203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69169146 + 69169147.

It is an arithmetic number, because the mean of its divisors is an integer number (69169147).

Almost surely, 2^138338293 is an apocalyptic number.

It is an amenable number.

138338293 is a deficient number, since it is larger than the sum of its proper divisors (1).

138338293 is an equidigital number, since it uses as much as digits as its factorization.

138338293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 138338293 is about 11761.7300173061. The cubic root of 138338293 is about 517.1868462547.

The spelling of 138338293 in words is "one hundred thirty-eight million, three hundred thirty-eight thousand, two hundred ninety-three".