1808839 has 2 divisors, whose sum is σ = 1808840. Its totient is φ = 1808838.

The previous prime is 1808831. The next prime is 1808843. The reversal of 1808839 is 9388081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1808839 - 2³ = 1808831 is a prime.

It is a Chen prime.

1808839 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1808798 and 1808807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904419 + 904420.

It is an arithmetic number, because the mean of its divisors is an integer number (904420).

2^1808839 is an apocalyptic number.

1808839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808839 is an equidigital number, since it uses as much as digits as its factorization.

1808839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1808839 is about 1344.9308532412. The cubic root of 1808839 is about 121.8428281508.

The spelling of 1808839 in words is "one million, eight hundred eight thousand, eight hundred thirty-nine".