3856815845 has 8 divisors (see below), whose sum is σ = 4640792064. Its totient is φ = 3077043984.

The previous prime is 3856815841. The next prime is 3856815869. The reversal of 3856815845 is 5485186583.

It is a happy number.

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 3856815845 - 2² = 3856815841 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3856815841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049069 + ... + 1052738.

It is an arithmetic number, because the mean of its divisors is an integer number (580099008).

Almost surely, 2^3856815845 is an apocalyptic number.

It is an amenable number.

3856815845 is a deficient number, since it is larger than the sum of its proper divisors (783976219).

3856815845 is a wasteful number, since it uses less digits than its factorization.

3856815845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102179.

The product of its digits is 4608000, while the sum is 53.

The square root of 3856815845 is about 62103.2675871407. The cubic root of 3856815845 is about 1568.2295545678.

The spelling of 3856815845 in words is "three billion, eight hundred fifty-six million, eight hundred fifteen thousand, eight hundred forty-five".