138404093 has 2 divisors, whose sum is σ = 138404094. Its totient is φ = 138404092.

The previous prime is 138404083. The next prime is 138404207. The reversal of 138404093 is 390404831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137053849 + 1350244 = 11707^2 + 1162^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138404093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138404023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69202046 + 69202047.

It is an arithmetic number, because the mean of its divisors is an integer number (69202047).

Almost surely, 2^138404093 is an apocalyptic number.

It is an amenable number.

138404093 is a deficient number, since it is larger than the sum of its proper divisors (1).

138404093 is an equidigital number, since it uses as much as digits as its factorization.

138404093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 138404093 is about 11764.5268923149. The cubic root of 138404093 is about 517.2688324727.

The spelling of 138404093 in words is "one hundred thirty-eight million, four hundred four thousand, ninety-three".