684443 has 2 divisors, whose sum is σ = 684444. Its totient is φ = 684442.

The previous prime is 684433. The next prime is 684451. The reversal of 684443 is 344486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684443 - 2⁴ = 684427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (684433) 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, 342221 + 342222.

It is an arithmetic number, because the mean of its divisors is an integer number (342222).

2⁶⁸⁴⁴⁴³ is an apocalyptic number.

684443 is a deficient number, since it is larger than the sum of its proper divisors (1).

684443 is an equidigital number, since it uses as much as digits as its factorization.

684443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 29.

The square root of 684443 is about 827.3107034241. The cubic root of 684443 is about 88.1276985576.

The spelling of 684443 in words is "six hundred eighty-four thousand, four hundred forty-three".