816847 has 2 divisors, whose sum is σ = 816848. Its totient is φ = 816846.

The previous prime is 816841. The next prime is 816857. The reversal of 816847 is 748618.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816847 - 2³ = 816839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816841) 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 as a sum of consecutive naturals, namely, 408423 + 408424.

It is an arithmetic number, because the mean of its divisors is an integer number (408424).

2⁸¹⁶⁸⁴⁷ is an apocalyptic number.

816847 is a deficient number, since it is larger than the sum of its proper divisors (1).

816847 is an equidigital number, since it uses as much as digits as its factorization.

816847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 816847 is about 903.7958840358. The cubic root of 816847 is about 93.4788955961.

The spelling of 816847 in words is "eight hundred sixteen thousand, eight hundred forty-seven".