16855243 has 4 divisors (see below), whose sum is σ = 16881480. Its totient is φ = 16829008.

The previous prime is 16855213. The next prime is 16855249. The reversal of 16855243 is 34255861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16855243 - 2¹⁷ = 16724171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16855199 and 16855208.

It is not an unprimeable number, because it can be changed into a prime (16855249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12130 + ... + 13447.

It is an arithmetic number, because the mean of its divisors is an integer number (4220370).

Almost surely, 2^16855243 is an apocalyptic number.

16855243 is a deficient number, since it is larger than the sum of its proper divisors (26237).

16855243 is an equidigital number, since it uses as much as digits as its factorization.

16855243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26236.

The product of its digits is 28800, while the sum is 34.

The square root of 16855243 is about 4105.5137315566. The cubic root of 16855243 is about 256.3962521853.

The spelling of 16855243 in words is "sixteen million, eight hundred fifty-five thousand, two hundred forty-three".