684442 has 16 divisors (see below), whose sum is σ = 1143072. Its totient is φ = 304720.

The previous prime is 684433. The next prime is 684443. The reversal of 684442 is 244486.

684442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 684442.

It is not an unprimeable number, because it can be changed into a prime (684443) by changing a digit.

684442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 873 + ... + 1459.

It is an arithmetic number, because the mean of its divisors is an integer number (71442).

2⁶⁸⁴⁴⁴² is an apocalyptic number.

684442 is a deficient number, since it is larger than the sum of its proper divisors (458630).

684442 is a wasteful number, since it uses less digits than its factorization.

684442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653.

The product of its digits is 6144, while the sum is 28.

The square root of 684442 is about 827.3100990560. The cubic root of 684442 is about 88.1276556382.

It can be divided in two parts, 6844 and 42, that added together give a palindrome (6886).

The spelling of 684442 in words is "six hundred eighty-four thousand, four hundred forty-two".