840349441 has 2 divisors, whose sum is σ = 840349442. Its totient is φ = 840349440.

The previous prime is 840349429. The next prime is 840349451. The reversal of 840349441 is 144943048.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714011841 + 126337600 = 26721^2 + 11240^2 .

It is a cyclic number.

It is not a de Polignac number, because 840349441 - 2¹¹ = 840347393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840349441.

It is not a weakly prime, because it can be changed into another prime (840349451) 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, 420174720 + 420174721.

It is an arithmetic number, because the mean of its divisors is an integer number (420174721).

Almost surely, 2^840349441 is an apocalyptic number.

It is an amenable number.

840349441 is a deficient number, since it is larger than the sum of its proper divisors (1).

840349441 is an equidigital number, since it uses as much as digits as its factorization.

840349441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 840349441 is about 28988.7812955288. The cubic root of 840349441 is about 943.6696156788.

The spelling of 840349441 in words is "eight hundred forty million, three hundred forty-nine thousand, four hundred forty-one".