3872805817 has 2 divisors, whose sum is σ = 3872805818. Its totient is φ = 3872805816.

The previous prime is 3872805809. The next prime is 3872805857. The reversal of 3872805817 is 7185082783.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3589927056 + 282878761 = 59916^2 + 16819^2 .

It is an emirp because it is prime and its reverse (7185082783) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3872805817 - 2³ = 3872805809 is a prime.

It is not a weakly prime, because it can be changed into another prime (3872805857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1936402908 + 1936402909.

It is an arithmetic number, because the mean of its divisors is an integer number (1936402909).

Almost surely, 2^3872805817 is an apocalyptic number.

It is an amenable number.

3872805817 is a deficient number, since it is larger than the sum of its proper divisors (1).

3872805817 is an equidigital number, since it uses as much as digits as its factorization.

3872805817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 752640, while the sum is 49.

The square root of 3872805817 is about 62231.8713923983. The cubic root of 3872805817 is about 1570.3938072528.

The spelling of 3872805817 in words is "three billion, eight hundred seventy-two million, eight hundred five thousand, eight hundred seventeen".