3865868881 has 16 divisors (see below), whose sum is σ = 4495305600. Its totient is φ = 3256184448.

The previous prime is 3865868869. The next prime is 3865868887. The reversal of 3865868881 is 1888685683.

It is a cyclic number.

It is not a de Polignac number, because 3865868881 - 2⁵ = 3865868849 is a prime.

It is a super-2 number, since 2×3865868881² = 29889884410168384322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3865868887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82515 + ... + 120583.

It is an arithmetic number, because the mean of its divisors is an integer number (280956600).

Almost surely, 2^3865868881 is an apocalyptic number.

It is an amenable number.

3865868881 is a deficient number, since it is larger than the sum of its proper divisors (629436719).

3865868881 is a wasteful number, since it uses less digits than its factorization.

3865868881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38328.

The product of its digits is 17694720, while the sum is 61.

The square root of 3865868881 is about 62176.1118195726. Note that the first 3 decimals coincide. The cubic root of 3865868881 is about 1569.4556216430.

The spelling of 3865868881 in words is "three billion, eight hundred sixty-five million, eight hundred sixty-eight thousand, eight hundred eighty-one".