7128223 has 2 divisors, whose sum is σ = 7128224. Its totient is φ = 7128222.

The previous prime is 7128221. The next prime is 7128227. The reversal of 7128223 is 3228217.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7128223 - 2¹ = 7128221 is a prime.

Together with 7128221, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7128221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3564111 + 3564112.

It is an arithmetic number, because the mean of its divisors is an integer number (3564112).

Almost surely, 2^7128223 is an apocalyptic number.

7128223 is a deficient number, since it is larger than the sum of its proper divisors (1).

7128223 is an equidigital number, since it uses as much as digits as its factorization.

7128223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 7128223 is about 2669.8732179637. The cubic root of 7128223 is about 192.4540667377.

The spelling of 7128223 in words is "seven million, one hundred twenty-eight thousand, two hundred twenty-three".