816855 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 389760.

The previous prime is 816847. The next prime is 816857. The reversal of 816855 is 558618.

It is not a de Polignac number, because 816855 - 2³ = 816847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816857) 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 31 ways as a sum of consecutive naturals, for example, 11470 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁸¹⁶⁸⁵⁵ is an apocalyptic number.

816855 is a deficient number, since it is larger than the sum of its proper divisors (634665).

816855 is a wasteful number, since it uses less digits than its factorization.

816855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151.

The product of its digits is 9600, while the sum is 33.

The square root of 816855 is about 903.8003098030. The cubic root of 816855 is about 93.4792007650.

The spelling of 816855 in words is "eight hundred sixteen thousand, eight hundred fifty-five".