3856819851 has 6 divisors (see below), whose sum is σ = 5570962020. Its totient is φ = 2571213228.

The previous prime is 3856819849. The next prime is 3856819871. The reversal of 3856819851 is 1589186583.

It is not a de Polignac number, because 3856819851 - 2¹ = 3856819849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3856819871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214267761 + ... + 214267778.

It is an arithmetic number, because the mean of its divisors is an integer number (928493670).

Almost surely, 2^3856819851 is an apocalyptic number.

3856819851 is a deficient number, since it is larger than the sum of its proper divisors (1714142169).

3856819851 is a wasteful number, since it uses less digits than its factorization.

3856819851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428535545 (or 428535542 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 54.

The square root of 3856819851 is about 62103.2998398636. The cubic root of 3856819851 is about 1568.2300975309.

The spelling of 3856819851 in words is "three billion, eight hundred fifty-six million, eight hundred nineteen thousand, eight hundred fifty-one".