138645743 has 2 divisors, whose sum is σ = 138645744. Its totient is φ = 138645742.

The previous prime is 138645739. The next prime is 138645769. The reversal of 138645743 is 347546831.

It is a weak prime.

It is an emirp because it is prime and its reverse (347546831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138645743 - 2² = 138645739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138645743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138645343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69322871 + 69322872.

It is an arithmetic number, because the mean of its divisors is an integer number (69322872).

Almost surely, 2^138645743 is an apocalyptic number.

138645743 is a deficient number, since it is larger than the sum of its proper divisors (1).

138645743 is an equidigital number, since it uses as much as digits as its factorization.

138645743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 41.

The square root of 138645743 is about 11774.7926945658. The cubic root of 138645743 is about 517.5697034787.

The spelling of 138645743 in words is "one hundred thirty-eight million, six hundred forty-five thousand, seven hundred forty-three".