3971640073 has 2 divisors, whose sum is σ = 3971640074. Its totient is φ = 3971640072.

The previous prime is 3971639993. The next prime is 3971640077. The reversal of 3971640073 is 3700461793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3541202064 + 430438009 = 59508^2 + 20747^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971640073 - 2¹⁷ = 3971509001 is a prime.

It is not a weakly prime, because it can be changed into another prime (3971640077) by changing a digit.

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 as a sum of consecutive naturals, namely, 1985820036 + 1985820037.

It is an arithmetic number, because the mean of its divisors is an integer number (1985820037).

Almost surely, 2^3971640073 is an apocalyptic number.

It is an amenable number.

3971640073 is a deficient number, since it is larger than the sum of its proper divisors (1).

3971640073 is an equidigital number, since it uses as much as digits as its factorization.

3971640073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 40.

The square root of 3971640073 is about 63020.9494771382. The cubic root of 3971640073 is about 1583.6406025808.

The spelling of 3971640073 in words is "three billion, nine hundred seventy-one million, six hundred forty thousand, seventy-three".