2809439 has 2 divisors, whose sum is σ = 2809440. Its totient is φ = 2809438.

The previous prime is 2809423. The next prime is 2809451. The reversal of 2809439 is 9349082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2809439 - 2⁴ = 2809423 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 2809399 and 2809408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2809409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404719 + 1404720.

It is an arithmetic number, because the mean of its divisors is an integer number (1404720).

2^2809439 is an apocalyptic number.

2809439 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809439 is an equidigital number, since it uses as much as digits as its factorization.

2809439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 2809439 is about 1676.1381208003. The cubic root of 2809439 is about 141.1041766535.

The spelling of 2809439 in words is "two million, eight hundred nine thousand, four hundred thirty-nine".