823841 has 2 divisors, whose sum is σ = 823842. Its totient is φ = 823840.

The previous prime is 823831. The next prime is 823843. The reversal of 823841 is 148328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 802816 + 21025 = 896^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 823841 - 2⁶ = 823777 is a prime.

Together with 823843, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 823841.

It is not a weakly prime, because it can be changed into another prime (823843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411920 + 411921.

It is an arithmetic number, because the mean of its divisors is an integer number (411921).

2⁸²³⁸⁴¹ is an apocalyptic number.

It is an amenable number.

823841 is a deficient number, since it is larger than the sum of its proper divisors (1).

823841 is an equidigital number, since it uses as much as digits as its factorization.

823841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 26.

The square root of 823841 is about 907.6568734935. The cubic root of 823841 is about 93.7449324668.

The spelling of 823841 in words is "eight hundred twenty-three thousand, eight hundred forty-one".