3856391369 has 2 divisors, whose sum is σ = 3856391370. Its totient is φ = 3856391368.

The previous prime is 3856391327. The next prime is 3856391389. The reversal of 3856391369 is 9631936583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2399824144 + 1456567225 = 48988^2 + 38165^2 .

It is a cyclic number.

It is not a de Polignac number, because 3856391369 - 2¹⁶ = 3856325833 is a prime.

It is a super-2 number, since 2×3856391369² = 29743508781795388322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3856391369.

It is not a weakly prime, because it can be changed into another prime (3856391309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1928195684 + 1928195685.

It is an arithmetic number, because the mean of its divisors is an integer number (1928195685).

Almost surely, 2^3856391369 is an apocalyptic number.

It is an amenable number.

3856391369 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856391369 is an equidigital number, since it uses as much as digits as its factorization.

3856391369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 53.

The square root of 3856391369 is about 62099.8499917673. The cubic root of 3856391369 is about 1568.1720200404.

The spelling of 3856391369 in words is "three billion, eight hundred fifty-six million, three hundred ninety-one thousand, three hundred sixty-nine".