3971187945 has 32 divisors (see below), whose sum is σ = 7072391040. Its totient is φ = 2114216640.

The previous prime is 3971187937. The next prime is 3971187991. The reversal of 3971187945 is 5497811793.

It is a happy number.

It is not a de Polignac number, because 3971187945 - 2³ = 3971187937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3971187891 and 3971187900.

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 31 ways as a sum of consecutive naturals, for example, 51327 + ... + 102843.

It is an arithmetic number, because the mean of its divisors is an integer number (221012220).

Almost surely, 2^3971187945 is an apocalyptic number.

It is an amenable number.

3971187945 is a deficient number, since it is larger than the sum of its proper divisors (3101203095).

3971187945 is a wasteful number, since it uses less digits than its factorization.

3971187945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52102 (or 52096 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 3971187945 is about 63017.3622504148. The cubic root of 3971187945 is about 1583.5805068843.

The spelling of 3971187945 in words is "three billion, nine hundred seventy-one million, one hundred eighty-seven thousand, nine hundred forty-five".