840841 has 2 divisors, whose sum is σ = 840842. Its totient is φ = 840840.

The previous prime is 840839. The next prime is 840859. The reversal of 840841 is 148048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 802816 + 38025 = 896^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 840841 - 2¹ = 840839 is a prime.

Together with 840839, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (840821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420420 + 420421.

It is an arithmetic number, because the mean of its divisors is an integer number (420421).

2⁸⁴⁰⁸⁴¹ is an apocalyptic number.

It is an amenable number.

840841 is a deficient number, since it is larger than the sum of its proper divisors (1).

840841 is an equidigital number, since it uses as much as digits as its factorization.

840841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 840841 is about 916.9738273255. The cubic root of 840841 is about 94.3853578386.

Adding to 840841 its reverse (148048), we get a palindrome (988889).

It can be divided in two parts, 840 and 841, that added together give a square (1681 = 41²).

The spelling of 840841 in words is "eight hundred forty thousand, eight hundred forty-one".