684499 has 4 divisors (see below), whose sum is σ = 692280. Its totient is φ = 676720.

The previous prime is 684493. The next prime is 684527. The reversal of 684499 is 994486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684499 - 2¹⁵ = 651731 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684493) 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 in 3 ways as a sum of consecutive naturals, for example, 3757 + ... + 3934.

It is an arithmetic number, because the mean of its divisors is an integer number (173070).

2⁶⁸⁴⁴⁹⁹ is an apocalyptic number.

684499 is a deficient number, since it is larger than the sum of its proper divisors (7781).

684499 is an equidigital number, since it uses as much as digits as its factorization.

684499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780.

The product of its digits is 62208, while the sum is 40.

The square root of 684499 is about 827.3445473320. The cubic root of 684499 is about 88.1301019798.

The spelling of 684499 in words is "six hundred eighty-four thousand, four hundred ninety-nine".