138641843 has 2 divisors, whose sum is σ = 138641844. Its totient is φ = 138641842.

The previous prime is 138641773. The next prime is 138641887. The reversal of 138641843 is 348146831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138641843 - 2¹⁸ = 138379699 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138641797 and 138641806.

It is not a weakly prime, because it can be changed into another prime (138641543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69320921 + 69320922.

It is an arithmetic number, because the mean of its divisors is an integer number (69320922).

Almost surely, 2^138641843 is an apocalyptic number.

138641843 is a deficient number, since it is larger than the sum of its proper divisors (1).

138641843 is an equidigital number, since it uses as much as digits as its factorization.

138641843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 38.

The square root of 138641843 is about 11774.6270853900. The cubic root of 138641843 is about 517.5648504850.

The spelling of 138641843 in words is "one hundred thirty-eight million, six hundred forty-one thousand, eight hundred forty-three".