138843371 has 2 divisors, whose sum is σ = 138843372. Its totient is φ = 138843370.

The previous prime is 138843349. The next prime is 138843373. The reversal of 138843371 is 173348831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138843371 is a prime.

It is a Sophie Germain prime.

Together with 138843373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138843373) 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 as a sum of consecutive naturals, namely, 69421685 + 69421686.

It is an arithmetic number, because the mean of its divisors is an integer number (69421686).

Almost surely, 2^138843371 is an apocalyptic number.

138843371 is a deficient number, since it is larger than the sum of its proper divisors (1).

138843371 is an equidigital number, since it uses as much as digits as its factorization.

138843371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 138843371 is about 11783.1817010517. The cubic root of 138843371 is about 517.8155042786.

The spelling of 138843371 in words is "one hundred thirty-eight million, eight hundred forty-three thousand, three hundred seventy-one".