684984 has 16 divisors (see below), whose sum is σ = 1712520. Its totient is φ = 228320.

The previous prime is 684977. The next prime is 684989. The reversal of 684984 is 489486.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684989) by changing a digit.

684984 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 14247 + ... + 14294.

2⁶⁸⁴⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

684984 is an abundant number, since it is smaller than the sum of its proper divisors (1027536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684984 is a wasteful number, since it uses less digits than its factorization.

684984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28550 (or 28546 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 684984 is about 827.6376018524. The cubic root of 684984 is about 88.1509118511.

The spelling of 684984 in words is "six hundred eighty-four thousand, nine hundred eighty-four".