16685443 has 4 divisors (see below), whose sum is σ = 16721640. Its totient is φ = 16649248.

The previous prime is 16685441. The next prime is 16685447. The reversal of 16685443 is 34458661.

It is a happy number.

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 16685443 - 2¹ = 16685441 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16685441) 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, 17398 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (4180410).

Almost surely, 2^16685443 is an apocalyptic number.

16685443 is a deficient number, since it is larger than the sum of its proper divisors (36197).

16685443 is an equidigital number, since it uses as much as digits as its factorization.

16685443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36196.

The product of its digits is 69120, while the sum is 37.

The square root of 16685443 is about 4084.7818791216. The cubic root of 16685443 is about 255.5323646743.

The spelling of 16685443 in words is "sixteen million, six hundred eighty-five thousand, four hundred forty-three".