138133393 has 2 divisors, whose sum is σ = 138133394. Its totient is φ = 138133392.

The previous prime is 138133367. The next prime is 138133399. The reversal of 138133393 is 393331831.

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., 71351809 + 66781584 = 8447^2 + 8172^2 .

It is an emirp because it is prime and its reverse (393331831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138133393 - 2⁵ = 138133361 is a prime.

It is not a weakly prime, because it can be changed into another prime (138133399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69066696 + 69066697.

It is an arithmetic number, because the mean of its divisors is an integer number (69066697).

Almost surely, 2^138133393 is an apocalyptic number.

It is an amenable number.

138133393 is a deficient number, since it is larger than the sum of its proper divisors (1).

138133393 is an equidigital number, since it uses as much as digits as its factorization.

138133393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 34.

The square root of 138133393 is about 11753.0163362432. The cubic root of 138133393 is about 516.9313760216.

The spelling of 138133393 in words is "one hundred thirty-eight million, one hundred thirty-three thousand, three hundred ninety-three".