138316393 has 2 divisors, whose sum is σ = 138316394. Its totient is φ = 138316392.

The previous prime is 138316357. The next prime is 138316417. The reversal of 138316393 is 393613831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130233744 + 8082649 = 11412^2 + 2843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138316393 is a prime.

It is not a weakly prime, because it can be changed into another prime (138316793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69158196 + 69158197.

It is an arithmetic number, because the mean of its divisors is an integer number (69158197).

Almost surely, 2^138316393 is an apocalyptic number.

It is an amenable number.

138316393 is a deficient number, since it is larger than the sum of its proper divisors (1).

138316393 is an equidigital number, since it uses as much as digits as its factorization.

138316393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 37.

The square root of 138316393 is about 11760.7989949663. The cubic root of 138316393 is about 517.1595532822.

The spelling of 138316393 in words is "one hundred thirty-eight million, three hundred sixteen thousand, three hundred ninety-three".