16856225 has 6 divisors (see below), whose sum is σ = 20901750. Its totient is φ = 13484960.

The previous prime is 16856209. The next prime is 16856227. The reversal of 16856225 is 52265861.

It can be written as a sum of positive squares in 3 ways, for example, as 5234944 + 11621281 = 2288^2 + 3409^2 .

It is not a de Polignac number, because 16856225 - 2⁴ = 16856209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16856227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 337100 + ... + 337149.

It is an arithmetic number, because the mean of its divisors is an integer number (3483625).

Almost surely, 2^16856225 is an apocalyptic number.

It is an amenable number.

16856225 is a deficient number, since it is larger than the sum of its proper divisors (4045525).

16856225 is an equidigital number, since it uses as much as digits as its factorization.

16856225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674259 (or 674254 counting only the distinct ones).

The product of its digits is 28800, while the sum is 35.

The square root of 16856225 is about 4105.6333250791. The cubic root of 16856225 is about 256.4012313725.

The spelling of 16856225 in words is "sixteen million, eight hundred fifty-six thousand, two hundred twenty-five".