3872122785 has 20 divisors (see below), whose sum is σ = 6941139348. Its totient is φ = 2065131936.

The previous prime is 3872122783. The next prime is 3872122801. The reversal of 3872122785 is 5872212783.

It can be written as a sum of positive squares in 2 ways, for example, as 1551099456 + 2321023329 = 39384^2 + 48177^2 .

It is not a de Polignac number, because 3872122785 - 2¹ = 3872122783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3872122785.

It is not an unprimeable number, because it can be changed into a prime (3872122783) 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 in 19 ways as a sum of consecutive naturals, for example, 4779994 + ... + 4780803.

Almost surely, 2^3872122785 is an apocalyptic number.

It is an amenable number.

3872122785 is a deficient number, since it is larger than the sum of its proper divisors (3069016563).

3872122785 is an equidigital number, since it uses as much as digits as its factorization.

3872122785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560814 (or 9560805 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 3872122785 is about 62226.3833514370. The cubic root of 3872122785 is about 1570.3014803682.

The spelling of 3872122785 in words is "three billion, eight hundred seventy-two million, one hundred twenty-two thousand, seven hundred eighty-five".