16856213 has 8 divisors (see below), whose sum is σ = 18441216. Its totient is φ = 15280000.

The previous prime is 16856209. The next prime is 16856227. The reversal of 16856213 is 31265861.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16856213 - 2² = 16856209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16856213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16856293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213 + ... + 6213.

It is an arithmetic number, because the mean of its divisors is an integer number (2305152).

Almost surely, 2^16856213 is an apocalyptic number.

It is an amenable number.

16856213 is a deficient number, since it is larger than the sum of its proper divisors (1585003).

16856213 is a wasteful number, since it uses less digits than its factorization.

16856213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395.

The product of its digits is 8640, while the sum is 32.

The square root of 16856213 is about 4105.6318636721. The cubic root of 16856213 is about 256.4011705282.

The spelling of 16856213 in words is "sixteen million, eight hundred fifty-six thousand, two hundred thirteen".