684542 has 16 divisors (see below), whose sum is σ = 1083264. Its totient is φ = 324000.

The previous prime is 684527. The next prime is 684547. The reversal of 684542 is 245486.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 684542.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3692 + ... + 3872.

It is an arithmetic number, because the mean of its divisors is an integer number (67704).

2⁶⁸⁴⁵⁴² is an apocalyptic number.

684542 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

684542 is a deficient number, since it is larger than the sum of its proper divisors (398722).

684542 is a wasteful number, since it uses less digits than its factorization.

684542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275.

The product of its digits is 7680, while the sum is 29.

The square root of 684542 is about 827.3705336788. The cubic root of 684542 is about 88.1319473758.

It can be divided in two parts, 6 and 84542, that added together give a palindrome (84548).

The spelling of 684542 in words is "six hundred eighty-four thousand, five hundred forty-two".