138265189 has 8 divisors (see below), whose sum is σ = 142197368. Its totient is φ = 134343360.

The previous prime is 138265163. The next prime is 138265271. The reversal of 138265189 is 981562831.

It can be written as a sum of positive squares in 4 ways, for example, as 110880900 + 27384289 = 10530^2 + 5233^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138265189 - 2⁹ = 138264677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138265889) 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 in 7 ways as a sum of consecutive naturals, for example, 30319 + ... + 34579.

It is an arithmetic number, because the mean of its divisors is an integer number (17774671).

Almost surely, 2^138265189 is an apocalyptic number.

It is an amenable number.

138265189 is a deficient number, since it is larger than the sum of its proper divisors (3932179).

138265189 is an equidigital number, since it uses as much as digits as its factorization.

138265189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175.

The product of its digits is 103680, while the sum is 43.

The square root of 138265189 is about 11758.6219005460. The cubic root of 138265189 is about 517.0957288250.

The spelling of 138265189 in words is "one hundred thirty-eight million, two hundred sixty-five thousand, one hundred eighty-nine".