138843139 has 2 divisors, whose sum is σ = 138843140. Its totient is φ = 138843138.

The previous prime is 138843121. The next prime is 138843143. The reversal of 138843139 is 931348831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138843139 - 2⁷ = 138843011 is a prime.

It is not a weakly prime, because it can be changed into another prime (138843149) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69421569 + 69421570.

It is an arithmetic number, because the mean of its divisors is an integer number (69421570).

Almost surely, 2^138843139 is an apocalyptic number.

138843139 is a deficient number, since it is larger than the sum of its proper divisors (1).

138843139 is an equidigital number, since it uses as much as digits as its factorization.

138843139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 40.

The square root of 138843139 is about 11783.1718565079. The cubic root of 138843139 is about 517.8152158643.

The spelling of 138843139 in words is "one hundred thirty-eight million, eight hundred forty-three thousand, one hundred thirty-nine".