864223 has 2 divisors, whose sum is σ = 864224. Its totient is φ = 864222.

The previous prime is 864221. The next prime is 864251. The reversal of 864223 is 322468.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864223 - 2¹ = 864221 is a prime.

Together with 864221, it forms a pair of twin primes.

864223 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432111 + 432112.

It is an arithmetic number, because the mean of its divisors is an integer number (432112).

2⁸⁶⁴²²³ is an apocalyptic number.

864223 is a deficient number, since it is larger than the sum of its proper divisors (1).

864223 is an equidigital number, since it uses as much as digits as its factorization.

864223 is an odious number, because the sum of its binary digits is odd.

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

The square root of 864223 is about 929.6359502515. The cubic root of 864223 is about 95.2522566362.

The spelling of 864223 in words is "eight hundred sixty-four thousand, two hundred twenty-three".