3856381805 has 8 divisors (see below), whose sum is σ = 4628182272. Its totient is φ = 3084756048.

The previous prime is 3856381783. The next prime is 3856381843. The reversal of 3856381805 is 5081836583.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3856381805 - 2²² = 3852187501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3856381805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11144 + ... + 88526.

It is an arithmetic number, because the mean of its divisors is an integer number (578522784).

Almost surely, 2^3856381805 is an apocalyptic number.

It is an amenable number.

3856381805 is a deficient number, since it is larger than the sum of its proper divisors (771800467).

3856381805 is an equidigital number, since it uses as much as digits as its factorization.

3856381805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87355.

The product of its (nonzero) digits is 691200, while the sum is 47.

The square root of 3856381805 is about 62099.7729867026. The cubic root of 3856381805 is about 1568.1707236635.

The spelling of 3856381805 in words is "three billion, eight hundred fifty-six million, three hundred eighty-one thousand, eight hundred five".