138938559 has 8 divisors (see below), whose sum is σ = 191227392. Its totient is φ = 89637720.

The previous prime is 138938543. The next prime is 138938581. The reversal of 138938559 is 955839831.

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

It is not a de Polignac number, because 138938559 - 2⁴ = 138938543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138938519) 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 in 7 ways as a sum of consecutive naturals, for example, 746889 + ... + 747074.

It is an arithmetic number, because the mean of its divisors is an integer number (23903424).

Almost surely, 2^138938559 is an apocalyptic number.

138938559 is a deficient number, since it is larger than the sum of its proper divisors (52288833).

138938559 is a wasteful number, since it uses less digits than its factorization.

138938559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493997.

The product of its digits is 1166400, while the sum is 51.

The square root of 138938559 is about 11787.2201557449. The cubic root of 138938559 is about 517.9338116014.

The spelling of 138938559 in words is "one hundred thirty-eight million, nine hundred thirty-eight thousand, five hundred fifty-nine".