840080897 has 2 divisors, whose sum is σ = 840080898. Its totient is φ = 840080896.

The previous prime is 840080863. The next prime is 840080909. The reversal of 840080897 is 798080048.

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., 549855601 + 290225296 = 23449^2 + 17036^2 .

It is a cyclic number.

It is not a de Polignac number, because 840080897 - 2¹² = 840076801 is a prime.

It is not a weakly prime, because it can be changed into another prime (840080807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420040448 + 420040449.

It is an arithmetic number, because the mean of its divisors is an integer number (420040449).

Almost surely, 2^840080897 is an apocalyptic number.

It is an amenable number.

840080897 is a deficient number, since it is larger than the sum of its proper divisors (1).

840080897 is an equidigital number, since it uses as much as digits as its factorization.

840080897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 840080897 is about 28984.1490646181. The cubic root of 840080897 is about 943.5690845585.

The spelling of 840080897 in words is "eight hundred forty million, eighty thousand, eight hundred ninety-seven".