684546 has 16 divisors (see below), whose sum is σ = 1377408. Its totient is φ = 226800.

The previous prime is 684527. The next prime is 684547. The reversal of 684546 is 645486.

It is a happy number.

It is a super-2 number, since 2×684546² = 937206452232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416 + ... + 1836.

It is an arithmetic number, because the mean of its divisors is an integer number (86088).

2⁶⁸⁴⁵⁴⁶ is an apocalyptic number.

684546 is an abundant number, since it is smaller than the sum of its proper divisors (692862).

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

684546 is a wasteful number, since it uses less digits than its factorization.

684546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697.

The product of its digits is 23040, while the sum is 33.

The square root of 684546 is about 827.3729509719. The cubic root of 684546 is about 88.1321190366.

Subtracting from 684546 its reverse (645486), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 684546 in words is "six hundred eighty-four thousand, five hundred forty-six".