684223 has 4 divisors (see below), whose sum is σ = 695880. Its totient is φ = 672568.

The previous prime is 684221. The next prime is 684239. The reversal of 684223 is 322486.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684223 - 2¹ = 684221 is a prime.

It is a super-2 number, since 2×684223² = 936322227458, which contains 22 as substring.

It is a Duffinian number.

684223 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5740 + ... + 5857.

It is an arithmetic number, because the mean of its divisors is an integer number (173970).

2⁶⁸⁴²²³ is an apocalyptic number.

684223 is a deficient number, since it is larger than the sum of its proper divisors (11657).

684223 is a wasteful number, since it uses less digits than its factorization.

684223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11656.

The product of its digits is 2304, while the sum is 25.

The square root of 684223 is about 827.1777318086. The cubic root of 684223 is about 88.1182552724.

The spelling of 684223 in words is "six hundred eighty-four thousand, two hundred twenty-three".