816943 has 12 divisors (see below), whose sum is σ = 902208. Its totient is φ = 738720.

The previous prime is 816941. The next prime is 816947. The reversal of 816943 is 349618.

It is not a de Polignac number, because 816943 - 2¹ = 816941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816941) 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, 11155 + ... + 11227.

It is an arithmetic number, because the mean of its divisors is an integer number (75184).

2⁸¹⁶⁹⁴³ is an apocalyptic number.

816943 is a deficient number, since it is larger than the sum of its proper divisors (85265).

816943 is a wasteful number, since it uses less digits than its factorization.

816943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 123 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 816943 is about 903.8489918122. The cubic root of 816943 is about 93.4825574906.

The spelling of 816943 in words is "eight hundred sixteen thousand, nine hundred forty-three".