3861844857 has 40 divisors (see below), whose sum is σ = 6249741960. Its totient is φ = 2376410400.

The previous prime is 3861844849. The next prime is 3861844859. The reversal of 3861844857 is 7584481683.

3861844857 is a `hidden beast` number, since 3 + 86 + 1 + 84 + 485 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 506655081 + 3355189776 = 22509^2 + 57924^2 .

It is not a de Polignac number, because 3861844857 - 2³ = 3861844849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3861844859) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 167107 + ... + 188807.

It is an arithmetic number, because the mean of its divisors is an integer number (156243549).

Almost surely, 2^3861844857 is an apocalyptic number.

It is an amenable number.

3861844857 is a deficient number, since it is larger than the sum of its proper divisors (2387897103).

3861844857 is an equidigital number, since it uses as much as digits as its factorization.

3861844857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21752 (or 21717 counting only the distinct ones).

The product of its digits is 5160960, while the sum is 54.

The square root of 3861844857 is about 62143.7435064866. The cubic root of 3861844857 is about 1568.9108782445.

The spelling of 3861844857 in words is "three billion, eight hundred sixty-one million, eight hundred forty-four thousand, eight hundred fifty-seven".