8216859 has 12 divisors (see below), whose sum is σ = 12744744. Its totient is φ = 4695264.

The previous prime is 8216843. The next prime is 8216863. The reversal of 8216859 is 9586128.

It is not a de Polignac number, because 8216859 - 2⁴ = 8216843 is a prime.

It is a super-3 number, since 3×8216859³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (8216809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27802 + ... + 28095.

It is an arithmetic number, because the mean of its divisors is an integer number (1062062).

Almost surely, 2^8216859 is an apocalyptic number.

8216859 is a deficient number, since it is larger than the sum of its proper divisors (4527885).

8216859 is a wasteful number, since it uses less digits than its factorization.

8216859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55914 (or 55907 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The square root of 8216859 is about 2866.5064102492. The cubic root of 8216859 is about 201.7910707803.

The spelling of 8216859 in words is "eight million, two hundred sixteen thousand, eight hundred fifty-nine".