684236 has 18 divisors (see below), whose sum is σ = 1393308. Its totient is φ = 293160.

The previous prime is 684221. The next prime is 684239. The reversal of 684236 is 632486.

It is a junction number, because it is equal to n+sod(n) for n = 684199 and 684208.

It is not an unprimeable number, because it can be changed into a prime (684239) by changing a digit.

684236 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 5 ways as a sum of consecutive naturals, for example, 1550 + ... + 1941.

It is an arithmetic number, because the mean of its divisors is an integer number (77406).

2⁶⁸⁴²³⁶ is an apocalyptic number.

It is an amenable number.

684236 is an abundant number, since it is smaller than the sum of its proper divisors (709072).

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

684236 is a wasteful number, since it uses less digits than its factorization.

684236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509 (or 3500 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 684236 is about 827.1855898165. The cubic root of 684236 is about 88.1188133410.

The spelling of 684236 in words is "six hundred eighty-four thousand, two hundred thirty-six".