684885 has 8 divisors (see below), whose sum is σ = 1095840. Its totient is φ = 365264.

The previous prime is 684869. The next prime is 684889. The reversal of 684885 is 588486.

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 684885 - 2⁴ = 684869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684889) 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 7 ways as a sum of consecutive naturals, for example, 22815 + ... + 22844.

It is an arithmetic number, because the mean of its divisors is an integer number (136980).

2⁶⁸⁴⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

684885 is a deficient number, since it is larger than the sum of its proper divisors (410955).

684885 is a wasteful number, since it uses less digits than its factorization.

684885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45667.

The product of its digits is 61440, while the sum is 39.

The square root of 684885 is about 827.5777909055. The cubic root of 684885 is about 88.1466648610.

The spelling of 684885 in words is "six hundred eighty-four thousand, eight hundred eighty-five".