816856 has 8 divisors (see below), whose sum is σ = 1531620. Its totient is φ = 408424.

The previous prime is 816847. The next prime is 816857. The reversal of 816856 is 658618.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816857) by changing a digit.

816856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51046 + ... + 51061.

2⁸¹⁶⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

816856 is a deficient number, since it is larger than the sum of its proper divisors (714764).

816856 is a wasteful number, since it uses less digits than its factorization.

816856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102113 (or 102109 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 816856 is about 903.8008630224. The cubic root of 816856 is about 93.4792389109.

The spelling of 816856 in words is "eight hundred sixteen thousand, eight hundred fifty-six".