1808043209 has 16 divisors (see below), whose sum is σ = 2120227200. Its totient is φ = 1541136240.

The previous prime is 1808043169. The next prime is 1808043229. The reversal of 1808043209 is 9023408081.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1808043209 is a prime.

It is a super-2 number, since 2×1808043209² = 6538040491222035362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1808043229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47522 + ... + 76644.

It is an arithmetic number, because the mean of its divisors is an integer number (132514200).

Almost surely, 2^1808043209 is an apocalyptic number.

It is an amenable number.

1808043209 is a deficient number, since it is larger than the sum of its proper divisors (312183991).

1808043209 is an equidigital number, since it uses as much as digits as its factorization.

1808043209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29325 (or 29311 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1808043209 is about 42521.0913430029. The cubic root of 1808043209 is about 1218.2495745235.

The spelling of 1808043209 in words is "one billion, eight hundred eight million, forty-three thousand, two hundred nine".