3981781872 has 60 divisors (see below), whose sum is σ = 11170869840. Its totient is φ = 1323995904.

The previous prime is 3981781829. The next prime is 3981781901. The reversal of 3981781872 is 2781871893.

It is a happy number.

3981781872 is a `hidden beast` number, since 398 + 1 + 78 + 187 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 25093 + ... + 92699.

It is an arithmetic number, because the mean of its divisors is an integer number (186181164).

Almost surely, 2^3981781872 is an apocalyptic number.

It is an amenable number.

3981781872 is an abundant number, since it is smaller than the sum of its proper divisors (7189087968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3981781872 is a wasteful number, since it uses less digits than its factorization.

3981781872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68030 (or 68021 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 3981781872 is about 63101.3618870465. The cubic root of 3981781872 is about 1584.9874276453.

The spelling of 3981781872 in words is "three billion, nine hundred eighty-one million, seven hundred eighty-one thousand, eight hundred seventy-two".