3945727997 has 2 divisors, whose sum is σ = 3945727998. Its totient is φ = 3945727996.

The previous prime is 3945727979. The next prime is 3945728009. The reversal of 3945727997 is 7997275493.

Together with previous prime (3945727979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3503929636 + 441798361 = 59194^2 + 21019^2 .

It is a cyclic number.

It is not a de Polignac number, because 3945727997 - 2²⁰ = 3944679421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945724997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972863998 + 1972863999.

It is an arithmetic number, because the mean of its divisors is an integer number (1972863999).

Almost surely, 2^3945727997 is an apocalyptic number.

It is an amenable number.

3945727997 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945727997 is an equidigital number, since it uses as much as digits as its factorization.

3945727997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30005640, while the sum is 62.

The square root of 3945727997 is about 62815.0300246685. The cubic root of 3945727997 is about 1580.1890492426.

The spelling of 3945727997 in words is "three billion, nine hundred forty-five million, seven hundred twenty-seven thousand, nine hundred ninety-seven".