138842593 has 2 divisors, whose sum is σ = 138842594. Its totient is φ = 138842592.

The previous prime is 138842591. The next prime is 138842617. The reversal of 138842593 is 395248831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136960209 + 1882384 = 11703^2 + 1372^2 .

It is a cyclic number.

It is not a de Polignac number, because 138842593 - 2¹ = 138842591 is a prime.

Together with 138842591, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138842591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69421296 + 69421297.

It is an arithmetic number, because the mean of its divisors is an integer number (69421297).

Almost surely, 2^138842593 is an apocalyptic number.

It is an amenable number.

138842593 is a deficient number, since it is larger than the sum of its proper divisors (1).

138842593 is an equidigital number, since it uses as much as digits as its factorization.

138842593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The square root of 138842593 is about 11783.1486878508. The cubic root of 138842593 is about 517.8145370947.

The spelling of 138842593 in words is "one hundred thirty-eight million, eight hundred forty-two thousand, five hundred ninety-three".