816786 has 12 divisors (see below), whose sum is σ = 1769742. Its totient is φ = 272256.

The previous prime is 816779. The next prime is 816811. The reversal of 816786 is 687618.

816786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 680625 + 136161 = 825^2 + 369^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 816786.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22671 + ... + 22706.

2⁸¹⁶⁷⁸⁶ is an apocalyptic number.

816786 is an abundant number, since it is smaller than the sum of its proper divisors (952956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816786 is a wasteful number, since it uses less digits than its factorization.

816786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45385 (or 45382 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 816786 is about 903.7621368480. The cubic root of 816786 is about 93.4765686183.

The spelling of 816786 in words is "eight hundred sixteen thousand, seven hundred eighty-six".