840497023 has 2 divisors, whose sum is σ = 840497024. Its totient is φ = 840497022.

The previous prime is 840496991. The next prime is 840497029. The reversal of 840497023 is 320794048.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840497023 - 2⁵ = 840496991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840497029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420248511 + 420248512.

It is an arithmetic number, because the mean of its divisors is an integer number (420248512).

Almost surely, 2^840497023 is an apocalyptic number.

840497023 is a deficient number, since it is larger than the sum of its proper divisors (1).

840497023 is an equidigital number, since it uses as much as digits as its factorization.

840497023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 840497023 is about 28991.3266857521. The cubic root of 840497023 is about 943.7248548013.

The spelling of 840497023 in words is "eight hundred forty million, four hundred ninety-seven thousand, twenty-three".