3971487937 has 4 divisors (see below), whose sum is σ = 3972798676. Its totient is φ = 3970177200.

The previous prime is 3971487917. The next prime is 3971487941. The reversal of 3971487937 is 7397841793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2484922801 + 1486565136 = 49849^2 + 38556^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971487937 - 2³¹ = 1824004289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3971487917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650814 + ... + 656887.

It is an arithmetic number, because the mean of its divisors is an integer number (993199669).

Almost surely, 2^3971487937 is an apocalyptic number.

It is an amenable number.

3971487937 is a deficient number, since it is larger than the sum of its proper divisors (1310739).

3971487937 is a wasteful number, since it uses less digits than its factorization.

3971487937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1310738.

The product of its digits is 8001504, while the sum is 58.

The square root of 3971487937 is about 63019.7424383820. The cubic root of 3971487937 is about 1583.6203815623.

The spelling of 3971487937 in words is "three billion, nine hundred seventy-one million, four hundred eighty-seven thousand, nine hundred thirty-seven".