646223 has 4 divisors (see below), whose sum is σ = 651288. Its totient is φ = 641160.

The previous prime is 646199. The next prime is 646237. The reversal of 646223 is 322646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322646 = 2 ⋅161323.

It is a cyclic number.

It is not a de Polignac number, because 646223 - 2⁶ = 646159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646253) 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, 2336 + ... + 2597.

It is an arithmetic number, because the mean of its divisors is an integer number (162822).

2⁶⁴⁶²²³ is an apocalyptic number.

646223 is a deficient number, since it is larger than the sum of its proper divisors (5065).

646223 is a wasteful number, since it uses less digits than its factorization.

646223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064.

The product of its digits is 1728, while the sum is 23.

The square root of 646223 is about 803.8799661641. The cubic root of 646223 is about 86.4558006452.

Adding to 646223 its reverse (322646), we get a palindrome (968869).

The spelling of 646223 in words is "six hundred forty-six thousand, two hundred twenty-three".