138438193 has 2 divisors, whose sum is σ = 138438194. Its totient is φ = 138438192.

The previous prime is 138438169. The next prime is 138438239. The reversal of 138438193 is 391834831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73667889 + 64770304 = 8583^2 + 8048^2 .

It is a cyclic number.

It is not a de Polignac number, because 138438193 - 2¹³ = 138430001 is a prime.

It is a super-2 number, since 2×138438193² = 38330266562210498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138438133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69219096 + 69219097.

It is an arithmetic number, because the mean of its divisors is an integer number (69219097).

Almost surely, 2^138438193 is an apocalyptic number.

It is an amenable number.

138438193 is a deficient number, since it is larger than the sum of its proper divisors (1).

138438193 is an equidigital number, since it uses as much as digits as its factorization.

138438193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 138438193 is about 11765.9760751074. The cubic root of 138438193 is about 517.3113105488.

The spelling of 138438193 in words is "one hundred thirty-eight million, four hundred thirty-eight thousand, one hundred ninety-three".