840408743 has 2 divisors, whose sum is σ = 840408744. Its totient is φ = 840408742.

The previous prime is 840408733. The next prime is 840408749. The reversal of 840408743 is 347804048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840408743 - 2²² = 836214439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840408697 and 840408706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840408749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420204371 + 420204372.

It is an arithmetic number, because the mean of its divisors is an integer number (420204372).

Almost surely, 2^840408743 is an apocalyptic number.

840408743 is a deficient number, since it is larger than the sum of its proper divisors (1).

840408743 is an equidigital number, since it uses as much as digits as its factorization.

840408743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 38.

The square root of 840408743 is about 28989.8041214493. The cubic root of 840408743 is about 943.6918128650.

The spelling of 840408743 in words is "eight hundred forty million, four hundred eight thousand, seven hundred forty-three".