138758423 has 2 divisors, whose sum is σ = 138758424. Its totient is φ = 138758422.

The previous prime is 138758419. The next prime is 138758447. The reversal of 138758423 is 324857831.

It is a weak prime.

It is an emirp because it is prime and its reverse (324857831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138758423 - 2² = 138758419 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138758483) 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, 69379211 + 69379212.

It is an arithmetic number, because the mean of its divisors is an integer number (69379212).

Almost surely, 2^138758423 is an apocalyptic number.

138758423 is a deficient number, since it is larger than the sum of its proper divisors (1).

138758423 is an equidigital number, since it uses as much as digits as its factorization.

138758423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 41.

The square root of 138758423 is about 11779.5765204017. The cubic root of 138758423 is about 517.7098783851.

The spelling of 138758423 in words is "one hundred thirty-eight million, seven hundred fifty-eight thousand, four hundred twenty-three".