3973946999909 has 2 divisors, whose sum is σ = 3973946999910. Its totient is φ = 3973946999908.

The previous prime is 3973946999873. The next prime is 3973946999983. The reversal of 3973946999909 is 9099996493793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3611178096100 + 362768903809 = 1900310^2 + 602303^2 .

It is an emirp because it is prime and its reverse (9099996493793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3973946999909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3973946999609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1986973499954 + 1986973499955.

It is an arithmetic number, because the mean of its divisors is an integer number (1986973499955).

Almost surely, 2^{3973946999909} is an apocalyptic number.

It is an amenable number.

3973946999909 is a deficient number, since it is larger than the sum of its proper divisors (1).

3973946999909 is an equidigital number, since it uses as much as digits as its factorization.

3973946999909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7231849128, while the sum is 86.

The spelling of 3973946999909 in words is "three trillion, nine hundred seventy-three billion, nine hundred forty-six million, nine hundred ninety-nine thousand, nine hundred nine".