840241 has 2 divisors, whose sum is σ = 840242. Its totient is φ = 840240.

The previous prime is 840239. The next prime is 840253. The reversal of 840241 is 142048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 772641 + 67600 = 879^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 840241 - 2¹ = 840239 is a prime.

Together with 840239, it forms a pair of twin primes.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (840341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420120 + 420121.

It is an arithmetic number, because the mean of its divisors is an integer number (420121).

2⁸⁴⁰²⁴¹ is an apocalyptic number.

It is an amenable number.

840241 is a deficient number, since it is larger than the sum of its proper divisors (1).

840241 is an equidigital number, since it uses as much as digits as its factorization.

840241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 840241 is about 916.6466058411. The cubic root of 840241 is about 94.3629022693.

Adding to 840241 its reverse (142048), we get a palindrome (982289).

It can be divided in two parts, 840 and 241, that added together give a triangular number (1081 = T₄₆).

The spelling of 840241 in words is "eight hundred forty thousand, two hundred forty-one".