684042 has 16 divisors (see below), whose sum is σ = 1378080. Its totient is φ = 226352.

The previous prime is 684037. The next prime is 684053. The reversal of 684042 is 240486.

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 684042.

It is an unprimeable number.

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, 709 + ... + 1367.

It is an arithmetic number, because the mean of its divisors is an integer number (86130).

2⁶⁸⁴⁰⁴² is an apocalyptic number.

684042 is an abundant number, since it is smaller than the sum of its proper divisors (694038).

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

684042 is a wasteful number, since it uses less digits than its factorization.

684042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 684042 is about 827.0683164044. The cubic root of 684042 is about 88.1104845063.

Subtracting from 684042 its reverse (240486), we obtain a square (443556 = 666²).

It can be divided in two parts, 6 and 84042, that added together give a palindrome (84048).

The spelling of 684042 in words is "six hundred eighty-four thousand, forty-two".