3981918772 has 96 divisors (see below), whose sum is σ = 8169154560. Its totient is φ = 1681612800.

The previous prime is 3981918767. The next prime is 3981918817. The reversal of 3981918772 is 2778191893.

3981918772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9929772 + ... + 9930172.

It is an arithmetic number, because the mean of its divisors is an integer number (85095360).

Almost surely, 2^3981918772 is an apocalyptic number.

It is an amenable number.

3981918772 is an abundant number, since it is smaller than the sum of its proper divisors (4187235788).

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

3981918772 is a wasteful number, since it uses less digits than its factorization.

3981918772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 719 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 55.

The square root of 3981918772 is about 63102.4466403641. The cubic root of 3981918772 is about 1585.0055922341.

The spelling of 3981918772 in words is "three billion, nine hundred eighty-one million, nine hundred eighteen thousand, seven hundred seventy-two".