684005 has 8 divisors (see below), whose sum is σ = 938112. Its totient is φ = 469008.

The previous prime is 683983. The next prime is 684007. The reversal of 684005 is 500486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 684005 - 2¹² = 679909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684007) 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 in 7 ways as a sum of consecutive naturals, for example, 9737 + ... + 9806.

It is an arithmetic number, because the mean of its divisors is an integer number (117264).

2⁶⁸⁴⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

684005 is a deficient number, since it is larger than the sum of its proper divisors (254107).

684005 is a wasteful number, since it uses less digits than its factorization.

684005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19555.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 684005 is about 827.0459479376. The cubic root of 684005 is about 88.1088958383.

The spelling of 684005 in words is "six hundred eighty-four thousand, five".