684386 has 8 divisors (see below), whose sum is σ = 1087020. Its totient is φ = 322048.

The previous prime is 684379. The next prime is 684407. The reversal of 684386 is 683486.

It can be written as a sum of positive squares in 2 ways, for example, as 591361 + 93025 = 769^2 + 305^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 684386.

It is an unprimeable number.

684386 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, 10031 + ... + 10098.

2⁶⁸⁴³⁸⁶ is an apocalyptic number.

684386 is a deficient number, since it is larger than the sum of its proper divisors (402634).

684386 is a wasteful number, since it uses less digits than its factorization.

684386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20148.

The product of its digits is 27648, while the sum is 35.

The square root of 684386 is about 827.2762537387. The cubic root of 684386 is about 88.1252520825.

Subtracting from 684386 its reverse (683486), we obtain a square (900 = 30²).

The spelling of 684386 in words is "six hundred eighty-four thousand, three hundred eighty-six".