643223 has 6 divisors (see below), whose sum is σ = 748296. Its totient is φ = 551292.

The previous prime is 643217. The next prime is 643231. The reversal of 643223 is 322346.

643223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643223 - 2¹⁰ = 642199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 643195 and 643204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6515 + ... + 6612.

It is an arithmetic number, because the mean of its divisors is an integer number (124716).

2⁶⁴³²²³ is an apocalyptic number.

643223 is a deficient number, since it is larger than the sum of its proper divisors (105073).

643223 is a wasteful number, since it uses less digits than its factorization.

643223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13141 (or 13134 counting only the distinct ones).

The product of its digits is 864, while the sum is 20.

The square root of 643223 is about 802.0118452991. The cubic root of 643223 is about 86.3218067559.

Adding to 643223 its reverse (322346), we get a palindrome (965569).

The spelling of 643223 in words is "six hundred forty-three thousand, two hundred twenty-three".