3981386181 has 16 divisors (see below), whose sum is σ = 5579766144. Its totient is φ = 2520317184.

The previous prime is 3981386177. The next prime is 3981386261. The reversal of 3981386181 is 1816831893.

It is not a de Polignac number, because 3981386181 - 2² = 3981386177 is a prime.

It is a super-2 number, since 2×3981386181² = 31702871844515529522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3981386181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981386161) 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, 201136 + ... + 220041.

It is an arithmetic number, because the mean of its divisors is an integer number (348735384).

Almost surely, 2^3981386181 is an apocalyptic number.

It is an amenable number.

3981386181 is a deficient number, since it is larger than the sum of its proper divisors (1598379963).

3981386181 is a wasteful number, since it uses less digits than its factorization.

3981386181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421340.

The product of its digits is 248832, while the sum is 48.

The square root of 3981386181 is about 63098.2264489264. The cubic root of 3981386181 is about 1584.9349230082.

The spelling of 3981386181 in words is "three billion, nine hundred eighty-one million, three hundred eighty-six thousand, one hundred eighty-one".