684404473 has 2 divisors, whose sum is σ = 684404474. Its totient is φ = 684404472.

The previous prime is 684404467. The next prime is 684404521. The reversal of 684404473 is 374404486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678706704 + 5697769 = 26052^2 + 2387^2 .

It is a cyclic number.

It is not a de Polignac number, because 684404473 - 2⁹ = 684403961 is a prime.

It is not a weakly prime, because it can be changed into another prime (681404473) 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, 342202236 + 342202237.

It is an arithmetic number, because the mean of its divisors is an integer number (342202237).

Almost surely, 2^684404473 is an apocalyptic number.

It is an amenable number.

684404473 is a deficient number, since it is larger than the sum of its proper divisors (1).

684404473 is an equidigital number, since it uses as much as digits as its factorization.

684404473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 258048, while the sum is 40.

The square root of 684404473 is about 26161.1252242712. The cubic root of 684404473 is about 881.2604496992.

The spelling of 684404473 in words is "six hundred eighty-four million, four hundred four thousand, four hundred seventy-three".