2900809 has 2 divisors, whose sum is σ = 2900810. Its totient is φ = 2900808.

The previous prime is 2900803. The next prime is 2900813. The reversal of 2900809 is 9080092.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2449225 + 451584 = 1565^2 + 672^2 .

It is a cyclic number.

It is not a de Polignac number, because 2900809 - 2⁹ = 2900297 is a prime.

It is a Chen prime.

2900809 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2900803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1450404 + 1450405.

It is an arithmetic number, because the mean of its divisors is an integer number (1450405).

2^2900809 is an apocalyptic number.

It is an amenable number.

2900809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2900809 is an equidigital number, since it uses as much as digits as its factorization.

2900809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 2900809 is about 1703.1761506080. The cubic root of 2900809 is about 142.6175740435.

The spelling of 2900809 in words is "two million, nine hundred thousand, eight hundred nine".