2072809 has 2 divisors, whose sum is σ = 2072810. Its totient is φ = 2072808.

The previous prime is 2072801. The next prime is 2072821. The reversal of 2072809 is 9082702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1432809 + 640000 = 1197^2 + 800^2 .

It is a cyclic number.

It is not a de Polignac number, because 2072809 - 2³ = 2072801 is a prime.

It is not a weakly prime, because it can be changed into another prime (2072801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1036404 + 1036405.

It is an arithmetic number, because the mean of its divisors is an integer number (1036405).

2^2072809 is an apocalyptic number.

It is an amenable number.

2072809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2072809 is an equidigital number, since it uses as much as digits as its factorization.

2072809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 2072809 is about 1439.7253210248. The cubic root of 2072809 is about 127.5028116771.

The spelling of 2072809 in words is "two million, seventy-two thousand, eight hundred nine".