816682843 has 4 divisors (see below), whose sum is σ = 816806560. Its totient is φ = 816559128.

The previous prime is 816682819. The next prime is 816682847. The reversal of 816682843 is 348286618.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 348286618 = 2 ⋅174143309.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-816682843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 816682793 and 816682802.

It is not an unprimeable number, because it can be changed into a prime (816682847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51363 + ... + 65356.

It is an arithmetic number, because the mean of its divisors is an integer number (204201640).

Almost surely, 2^816682843 is an apocalyptic number.

816682843 is a deficient number, since it is larger than the sum of its proper divisors (123717).

816682843 is a wasteful number, since it uses less digits than its factorization.

816682843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123716.

The product of its digits is 442368, while the sum is 46.

The square root of 816682843 is about 28577.6633579444. The cubic root of 816682843 is about 934.7263320627.

The spelling of 816682843 in words is "eight hundred sixteen million, six hundred eighty-two thousand, eight hundred forty-three".