138361393 has 2 divisors, whose sum is σ = 138361394. Its totient is φ = 138361392.

The previous prime is 138361387. The next prime is 138361403. The reversal of 138361393 is 393163831.

It is a happy number.

138361393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137545984 + 815409 = 11728^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 138361393 - 2⁵ = 138361361 is a prime.

It is not a weakly prime, because it can be changed into another prime (138361303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69180696 + 69180697.

It is an arithmetic number, because the mean of its divisors is an integer number (69180697).

Almost surely, 2^138361393 is an apocalyptic number.

It is an amenable number.

138361393 is a deficient number, since it is larger than the sum of its proper divisors (1).

138361393 is an equidigital number, since it uses as much as digits as its factorization.

138361393 is an evil number, because the sum of its binary digits is even.

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

The square root of 138361393 is about 11762.7119747106. The cubic root of 138361393 is about 517.2156316112.

The spelling of 138361393 in words is "one hundred thirty-eight million, three hundred sixty-one thousand, three hundred ninety-three".