138438364385 has 8 divisors (see below), whose sum is σ = 166140329256. Its totient is φ = 110741163520.

The previous prime is 138438364381. The next prime is 138438364391. The reversal of 138438364385 is 583463834831.

It can be written as a sum of positive squares in 4 ways, for example, as 48428164096 + 90010200289 = 220064^2 + 300017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138438364385 - 2² = 138438364381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138438364385.

It is not an unprimeable number, because it can be changed into a prime (138438364381) 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 in 7 ways as a sum of consecutive naturals, for example, 1126754 + ... + 1243563.

It is an arithmetic number, because the mean of its divisors is an integer number (20767541157).

Almost surely, 2^138438364385 is an apocalyptic number.

It is an amenable number.

138438364385 is a deficient number, since it is larger than the sum of its proper divisors (27701964871).

138438364385 is a wasteful number, since it uses less digits than its factorization.

138438364385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382003.

The product of its digits is 19906560, while the sum is 56.

The spelling of 138438364385 in words is "one hundred thirty-eight billion, four hundred thirty-eight million, three hundred sixty-four thousand, three hundred eighty-five".