1996387009 has 2 divisors, whose sum is σ = 1996387010. Its totient is φ = 1996387008.

The previous prime is 1996386961. The next prime is 1996387033. The reversal of 1996387009 is 9007836991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1938200625 + 58186384 = 44025^2 + 7628^2 .

It is an emirp because it is prime and its reverse (9007836991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1996387009 is a prime.

It is a super-2 number, since 2×1996387009² = 7971122179407932162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1996387049) 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, 998193504 + 998193505.

It is an arithmetic number, because the mean of its divisors is an integer number (998193505).

Almost surely, 2^1996387009 is an apocalyptic number.

It is an amenable number.

1996387009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1996387009 is an equidigital number, since it uses as much as digits as its factorization.

1996387009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 1996387009 is about 44680.9468230028. The cubic root of 1996387009 is about 1259.1619120158.

The spelling of 1996387009 in words is "one billion, nine hundred ninety-six million, three hundred eighty-seven thousand, nine".