840223 has 2 divisors, whose sum is σ = 840224. Its totient is φ = 840222.

The previous prime is 840197. The next prime is 840239. The reversal of 840223 is 322048.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840223 - 2¹⁷ = 709151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420111 + 420112.

It is an arithmetic number, because the mean of its divisors is an integer number (420112).

2⁸⁴⁰²²³ is an apocalyptic number.

840223 is a deficient number, since it is larger than the sum of its proper divisors (1).

840223 is an equidigital number, since it uses as much as digits as its factorization.

840223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 840223 is about 916.6367873918. The cubic root of 840223 is about 94.3622284371.

The spelling of 840223 in words is "eight hundred forty thousand, two hundred twenty-three".