1999920009 has 8 divisors (see below), whose sum is σ = 2667915360. Its totient is φ = 1332602336.

The previous prime is 1999920007. The next prime is 1999920047. The reversal of 1999920009 is 9000299991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1999920009 - 2¹ = 1999920007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1999920009.

It is not an unprimeable number, because it can be changed into a prime (1999920007) 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 in 7 ways as a sum of consecutive naturals, for example, 162492 + ... + 174365.

It is an arithmetic number, because the mean of its divisors is an integer number (333489420).

Almost surely, 2^1999920009 is an apocalyptic number.

It is an amenable number.

1999920009 is a deficient number, since it is larger than the sum of its proper divisors (667995351).

1999920009 is a wasteful number, since it uses less digits than its factorization.

1999920009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338839.

The product of its (nonzero) digits is 118098, while the sum is 48.

The square root of 1999920009 is about 44720.4652144854. The cubic root of 1999920009 is about 1259.9042526135.

The spelling of 1999920009 in words is "one billion, nine hundred ninety-nine million, nine hundred twenty thousand, nine".