16809843 has 8 divisors (see below), whose sum is σ = 23136256. Its totient is φ = 10845000.

The previous prime is 16809841. The next prime is 16809853. The reversal of 16809843 is 34890861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16809843 - 2¹ = 16809841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16809841) 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 in 7 ways as a sum of consecutive naturals, for example, 90283 + ... + 90468.

It is an arithmetic number, because the mean of its divisors is an integer number (2892032).

Almost surely, 2^16809843 is an apocalyptic number.

16809843 is a deficient number, since it is larger than the sum of its proper divisors (6326413).

16809843 is a wasteful number, since it uses less digits than its factorization.

16809843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180785.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 16809843 is about 4099.9808536138. The cubic root of 16809843 is about 256.1658420445.

The spelling of 16809843 in words is "sixteen million, eight hundred nine thousand, eight hundred forty-three".