3985543881 has 24 divisors (see below), whose sum is σ = 6426310176. Its totient is φ = 2359304640.

The previous prime is 3985543879. The next prime is 3985543889. The reversal of 3985543881 is 1883455893.

3985543881 is a `hidden beast` number, since 3 + 9 + 8 + 554 + 3 + 8 + 81 = 666.

It is not a de Polignac number, because 3985543881 - 2¹ = 3985543879 is a prime.

It is a super-2 number, since 2×3985543881² = 31769120054753084322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3985543889) 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 23 ways as a sum of consecutive naturals, for example, 463860 + ... + 472373.

It is an arithmetic number, because the mean of its divisors is an integer number (267762924).

Almost surely, 2^3985543881 is an apocalyptic number.

It is an amenable number.

3985543881 is a deficient number, since it is larger than the sum of its proper divisors (2440766295).

3985543881 is a wasteful number, since it uses less digits than its factorization.

3985543881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936293 (or 936290 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The square root of 3985543881 is about 63131.1641030007. The cubic root of 3985543881 is about 1585.4864387471.

The spelling of 3985543881 in words is "three billion, nine hundred eighty-five million, five hundred forty-three thousand, eight hundred eighty-one".