684402 has 8 divisors (see below), whose sum is σ = 1368816. Its totient is φ = 228132.

The previous prime is 684379. The next prime is 684407. The reversal of 684402 is 204486.

684402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

684402 is an admirable number.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (684407) by changing a digit.

684402 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 3 ways as a sum of consecutive naturals, for example, 57028 + ... + 57039.

It is an arithmetic number, because the mean of its divisors is an integer number (171102).

2⁶⁸⁴⁴⁰² is an apocalyptic number.

684402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

684402 is a wasteful number, since it uses less digits than its factorization.

684402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114072.

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

The square root of 684402 is about 827.2859239707. The cubic root of 684402 is about 88.1259388261.

Adding to 684402 its reverse (204486), we get a palindrome (888888).

The spelling of 684402 in words is "six hundred eighty-four thousand, four hundred two".