684923 has 2 divisors, whose sum is σ = 684924. Its totient is φ = 684922.

The previous prime is 684889. The next prime is 684949. The reversal of 684923 is 329486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 684923 - 2¹⁰ = 683899 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684923.

It is not a weakly prime, because it can be changed into another prime (684973) 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, 342461 + 342462.

It is an arithmetic number, because the mean of its divisors is an integer number (342462).

2⁶⁸⁴⁹²³ is an apocalyptic number.

684923 is a deficient number, since it is larger than the sum of its proper divisors (1).

684923 is an equidigital number, since it uses as much as digits as its factorization.

684923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 684923 is about 827.6007491538. The cubic root of 684923 is about 88.1482950672.

The spelling of 684923 in words is "six hundred eighty-four thousand, nine hundred twenty-three".