3945581712 has 40 divisors (see below), whose sum is σ = 11325282080. Its totient is φ = 1315193760.

The previous prime is 3945581681. The next prime is 3945581719. The reversal of 3945581712 is 2171855493.

3945581712 is a `hidden beast` number, since 3 + 94 + 558 + 1 + 7 + 1 + 2 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3945581719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4566214 + ... + 4567077.

It is an arithmetic number, because the mean of its divisors is an integer number (283132052).

Almost surely, 2^3945581712 is an apocalyptic number.

It is an amenable number.

3945581712 is an abundant number, since it is smaller than the sum of its proper divisors (7379700368).

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

3945581712 is a wasteful number, since it uses less digits than its factorization.

3945581712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9133308 (or 9133296 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 3945581712 is about 62813.8656030657. The cubic root of 3945581712 is about 1580.1695208808.

The spelling of 3945581712 in words is "three billion, nine hundred forty-five million, five hundred eighty-one thousand, seven hundred twelve".