138927238189 has 2 divisors, whose sum is σ = 138927238190. Its totient is φ = 138927238188.

The previous prime is 138927238159. The next prime is 138927238199. The reversal of 138927238189 is 981832729831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72732696100 + 66194542089 = 269690^2 + 257283^2 .

It is a cyclic number.

It is not a de Polignac number, because 138927238189 - 2⁹ = 138927237677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138927238159) 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 as a sum of consecutive naturals, namely, 69463619094 + 69463619095.

It is an arithmetic number, because the mean of its divisors is an integer number (69463619095).

Almost surely, 2^138927238189 is an apocalyptic number.

It is an amenable number.

138927238189 is a deficient number, since it is larger than the sum of its proper divisors (1).

138927238189 is an equidigital number, since it uses as much as digits as its factorization.

138927238189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 61.

The spelling of 138927238189 in words is "one hundred thirty-eight billion, nine hundred twenty-seven million, two hundred thirty-eight thousand, one hundred eighty-nine".