2009999 has 2 divisors, whose sum is σ = 2010000. Its totient is φ = 2009998.

The previous prime is 2009989. The next prime is 2010017. The reversal of 2009999 is 9999002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2009999 - 2⁴ = 2009983 is a prime.

2009999 is a modest number, since divided by 9999 gives 200 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2009989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004999 + 1005000.

It is an arithmetic number, because the mean of its divisors is an integer number (1005000).

2^2009999 is an apocalyptic number.

2009999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009999 is an equidigital number, since it uses as much as digits as its factorization.

2009999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 2009999 is about 1417.7443352029. The cubic root of 2009999 is about 126.2017218930.

The spelling of 2009999 in words is "two million, nine thousand, nine hundred ninety-nine".