3861861861 has 16 divisors (see below), whose sum is σ = 6049350720. Its totient is φ = 2160481920.

The previous prime is 3861861827. The next prime is 3861861889. The reversal of 3861861861 is 1681681683.

It is not a de Polignac number, because 3861861861 - 2⁹ = 3861861349 is a prime.

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 3861861861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3861861061) 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 15 ways as a sum of consecutive naturals, for example, 4500576 + ... + 4501433.

It is an arithmetic number, because the mean of its divisors is an integer number (378084420).

Almost surely, 2^3861861861 is an apocalyptic number.

It is an amenable number.

3861861861 is a deficient number, since it is larger than the sum of its proper divisors (2187488859).

3861861861 is a wasteful number, since it uses less digits than its factorization.

3861861861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9002036.

The product of its digits is 331776, while the sum is 48.

The square root of 3861861861 is about 62143.8803181778. The cubic root of 3861861861 is about 1568.9131809196.

The spelling of 3861861861 in words is "three billion, eight hundred sixty-one million, eight hundred sixty-one thousand, eight hundred sixty-one".