3872805857 has 2 divisors, whose sum is σ = 3872805858. Its totient is φ = 3872805856.

The previous prime is 3872805817. The next prime is 3872805869. The reversal of 3872805857 is 7585082783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3721122001 + 151683856 = 61001^2 + 12316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3872805857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3872805799 and 3872805808.

It is not a weakly prime, because it can be changed into another prime (3872805817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1936402928 + 1936402929.

It is an arithmetic number, because the mean of its divisors is an integer number (1936402929).

Almost surely, 2^3872805857 is an apocalyptic number.

It is an amenable number.

3872805857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3872805857 is an equidigital number, since it uses as much as digits as its factorization.

3872805857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3763200, while the sum is 53.

The square root of 3872805857 is about 62231.8717137770. The cubic root of 3872805857 is about 1570.3938126594.

The spelling of 3872805857 in words is "three billion, eight hundred seventy-two million, eight hundred five thousand, eight hundred fifty-seven".