684493 has 2 divisors, whose sum is σ = 684494. Its totient is φ = 684492.

The previous prime is 684473. The next prime is 684527. The reversal of 684493 is 394486.

It is an a-pointer prime, because the next prime (684527) can be obtained adding 684493 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635209 + 49284 = 797^2 + 222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684493 is a prime.

It is a congruent number.

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, 342246 + 342247.

It is an arithmetic number, because the mean of its divisors is an integer number (342247).

2⁶⁸⁴⁴⁹³ is an apocalyptic number.

It is an amenable number.

684493 is a deficient number, since it is larger than the sum of its proper divisors (1).

684493 is an equidigital number, since it uses as much as digits as its factorization.

684493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 684493 is about 827.3409212652. The cubic root of 684493 is about 88.1298444766.

The spelling of 684493 in words is "six hundred eighty-four thousand, four hundred ninety-three".