3861940145 has 12 divisors (see below), whose sum is σ = 5390953524. Its totient is φ = 2648187360.

The previous prime is 3861940081. The next prime is 3861940151. The reversal of 3861940145 is 5410491683.

It can be written as a sum of positive squares in 2 ways, for example, as 576816289 + 3285123856 = 24017^2 + 57316^2 .

It is not a de Polignac number, because 3861940145 - 2⁶ = 3861940081 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7881266 + ... + 7881755.

It is an arithmetic number, because the mean of its divisors is an integer number (449246127).

Almost surely, 2^3861940145 is an apocalyptic number.

3861940145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3861940145 is a deficient number, since it is larger than the sum of its proper divisors (1529013379).

3861940145 is a wasteful number, since it uses less digits than its factorization.

3861940145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15763040 (or 15763033 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 3861940145 is about 62144.5101758796. The cubic root of 3861940145 is about 1568.9237820212.

The spelling of 3861940145 in words is "three billion, eight hundred sixty-one million, nine hundred forty thousand, one hundred forty-five".