1996997729 has 2 divisors, whose sum is σ = 1996997730. Its totient is φ = 1996997728.

The previous prime is 1996997713. The next prime is 1996997777. The reversal of 1996997729 is 9277996991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1985593600 + 11404129 = 44560^2 + 3377^2 .

It is a cyclic number.

It is not a de Polignac number, because 1996997729 - 2⁴ = 1996997713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1996990729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998498864 + 998498865.

It is an arithmetic number, because the mean of its divisors is an integer number (998498865).

Almost surely, 2^1996997729 is an apocalyptic number.

It is an amenable number.

1996997729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996997729 is an equidigital number, since it uses as much as digits as its factorization.

1996997729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34720812, while the sum is 68.

The square root of 1996997729 is about 44687.7805333852. The cubic root of 1996997729 is about 1259.2902967691.

The spelling of 1996997729 in words is "one billion, nine hundred ninety-six million, nine hundred ninety-seven thousand, seven hundred twenty-nine".