3972727991 has 2 divisors, whose sum is σ = 3972727992. Its totient is φ = 3972727990.

The previous prime is 3972727987. The next prime is 3972728017. The reversal of 3972727991 is 1997272793.

It is a weak prime.

It is an emirp because it is prime and its reverse (1997272793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3972727991 - 2² = 3972727987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3972727901) 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, 1986363995 + 1986363996.

It is an arithmetic number, because the mean of its divisors is an integer number (1986363996).

Almost surely, 2^3972727991 is an apocalyptic number.

3972727991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3972727991 is an equidigital number, since it uses as much as digits as its factorization.

3972727991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000564, while the sum is 56.

The square root of 3972727991 is about 63029.5802857674. The cubic root of 3972727991 is about 1583.7851871688.

The spelling of 3972727991 in words is "three billion, nine hundred seventy-two million, seven hundred twenty-seven thousand, nine hundred ninety-one".