16800985 has 4 divisors (see below), whose sum is σ = 20161188. Its totient is φ = 13440784.

The previous prime is 16800967. The next prime is 16800989. The reversal of 16800985 is 58900861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12187081 + 4613904 = 3491^2 + 2148^2 .

It is a cyclic number.

It is not a de Polignac number, because 16800985 - 2⁹ = 16800473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16800989) 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, 1680094 + ... + 1680103.

It is an arithmetic number, because the mean of its divisors is an integer number (5040297).

Almost surely, 2^16800985 is an apocalyptic number.

It is an amenable number.

16800985 is a deficient number, since it is larger than the sum of its proper divisors (3360203).

16800985 is an equidigital number, since it uses as much as digits as its factorization.

16800985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360202.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 16800985 is about 4098.9004623191. The cubic root of 16800985 is about 256.1208383381.

The spelling of 16800985 in words is "sixteen million, eight hundred thousand, nine hundred eighty-five".