3943686139 has 2 divisors, whose sum is σ = 3943686140. Its totient is φ = 3943686138.

The previous prime is 3943686127. The next prime is 3943686161. The reversal of 3943686139 is 9316863493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3943686139 - 2¹⁷ = 3943555067 is a prime.

It is not a weakly prime, because it can be changed into another prime (3943686179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1971843069 + 1971843070.

It is an arithmetic number, because the mean of its divisors is an integer number (1971843070).

Almost surely, 2^3943686139 is an apocalyptic number.

3943686139 is a deficient number, since it is larger than the sum of its proper divisors (1).

3943686139 is an equidigital number, since it uses as much as digits as its factorization.

3943686139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 52.

The square root of 3943686139 is about 62798.7749800902. The cubic root of 3943686139 is about 1579.9164271076.

The spelling of 3943686139 in words is "three billion, nine hundred forty-three million, six hundred eighty-six thousand, one hundred thirty-nine".