684358 has 4 divisors (see below), whose sum is σ = 1026540. Its totient is φ = 342178.

The previous prime is 684349. The next prime is 684373. The reversal of 684358 is 853486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 853486 = 2 ⋅426743.

It is a congruent number.

It is an unprimeable number.

684358 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 as a sum of consecutive naturals, namely, 171088 + ... + 171091.

It is an arithmetic number, because the mean of its divisors is an integer number (256635).

2⁶⁸⁴³⁵⁸ is an apocalyptic number.

684358 is a deficient number, since it is larger than the sum of its proper divisors (342182).

684358 is a wasteful number, since it uses less digits than its factorization.

684358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342181.

The product of its digits is 23040, while the sum is 34.

The square root of 684358 is about 827.2593305609. The cubic root of 684358 is about 88.1240502555.

The spelling of 684358 in words is "six hundred eighty-four thousand, three hundred fifty-eight".