840645023 has 2 divisors, whose sum is σ = 840645024. Its totient is φ = 840645022.

The previous prime is 840645007. The next prime is 840645049. The reversal of 840645023 is 320546048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840645023 - 2⁴ = 840645007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840645623) 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, 420322511 + 420322512.

It is an arithmetic number, because the mean of its divisors is an integer number (420322512).

Almost surely, 2^840645023 is an apocalyptic number.

840645023 is a deficient number, since it is larger than the sum of its proper divisors (1).

840645023 is an equidigital number, since it uses as much as digits as its factorization.

840645023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 840645023 is about 28993.8790609328. The cubic root of 840645023 is about 943.7802438855.

The spelling of 840645023 in words is "eight hundred forty million, six hundred forty-five thousand, twenty-three".