3856393939 has 2 divisors, whose sum is σ = 3856393940. Its totient is φ = 3856393938.

The previous prime is 3856393921. The next prime is 3856393943. The reversal of 3856393939 is 9393936583.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9393936583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3856393939 - 2⁵ = 3856393907 is a prime.

It is not a weakly prime, because it can be changed into another prime (3856393909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928196969 + 1928196970.

It is an arithmetic number, because the mean of its divisors is an integer number (1928196970).

Almost surely, 2^3856393939 is an apocalyptic number.

3856393939 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856393939 is an equidigital number, since it uses as much as digits as its factorization.

3856393939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14171760, while the sum is 58.

The square root of 3856393939 is about 62099.8706842454. The cubic root of 3856393939 is about 1568.1723683973.

The spelling of 3856393939 in words is "three billion, eight hundred fifty-six million, three hundred ninety-three thousand, nine hundred thirty-nine".