847340489 has 2 divisors, whose sum is σ = 847340490. Its totient is φ = 847340488.

The previous prime is 847340449. The next prime is 847340497. The reversal of 847340489 is 984043748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828979264 + 18361225 = 28792^2 + 4285^2 .

It is a cyclic number.

It is not a de Polignac number, because 847340489 - 2¹² = 847336393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (847340449) 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, 423670244 + 423670245.

It is an arithmetic number, because the mean of its divisors is an integer number (423670245).

Almost surely, 2^847340489 is an apocalyptic number.

It is an amenable number.

847340489 is a deficient number, since it is larger than the sum of its proper divisors (1).

847340489 is an equidigital number, since it uses as much as digits as its factorization.

847340489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 47.

The square root of 847340489 is about 29109.1135041931. The cubic root of 847340489 is about 946.2792558780.

The spelling of 847340489 in words is "eight hundred forty-seven million, three hundred forty thousand, four hundred eighty-nine".