3986785881 has 27 divisors (see below), whose sum is σ = 6239595999. Its totient is φ = 2451891312.

The previous prime is 3986785879. The next prime is 3986785897. The reversal of 3986785881 is 1885876893.

The square root of 3986785881 is 63141.

It is a perfect power (a square), and thus also a powerful number.

3986785881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 589761225 + 3397024656 = 24285^2 + 58284^2 .

It is not a de Polignac number, because 3986785881 - 2¹ = 3986785879 is a prime.

It is a super-2 number, since 2×3986785881² = 31788923321881892322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3986785801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2461690 + ... + 2463308.

Almost surely, 2^3986785881 is an apocalyptic number.

3986785881 is the 63141-st square number.

3986785881 is the 31571-st centered octagonal number.

It is an amenable number.

3986785881 is a deficient number, since it is larger than the sum of its proper divisors (2252810118).

3986785881 is an equidigital number, since it uses as much as digits as its factorization.

3986785881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270 (or 1635 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The cubic root of 3986785881 is about 1585.6511146945.

The spelling of 3986785881 in words is "three billion, nine hundred eighty-six million, seven hundred eighty-five thousand, eight hundred eighty-one".