2820009 has 4 divisors (see below), whose sum is σ = 3760016. Its totient is φ = 1880004.

The previous prime is 2820001. The next prime is 2820017. The reversal of 2820009 is 9000282.

2820009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2820001) and next prime (2820017).

It is not a de Polignac number, because 2820009 - 2³ = 2820001 is a prime.

It is a D-number.

It is a Duffinian number.

2820009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2820001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469999 + ... + 470004.

It is an arithmetic number, because the mean of its divisors is an integer number (940004).

2^2820009 is an apocalyptic number.

It is an amenable number.

2820009 is a deficient number, since it is larger than the sum of its proper divisors (940007).

2820009 is an equidigital number, since it uses as much as digits as its factorization.

2820009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940006.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2820009 is about 1679.2882420835. The cubic root of 2820009 is about 141.2809147359.

The spelling of 2820009 in words is "two million, eight hundred twenty thousand, nine".