8223989 has 2 divisors, whose sum is σ = 8223990. Its totient is φ = 8223988.

The previous prime is 8223977. The next prime is 8223991. The reversal of 8223989 is 9893228.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5484964 + 2739025 = 2342^2 + 1655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8223989 is a prime.

Together with 8223991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8223289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4111994 + 4111995.

It is an arithmetic number, because the mean of its divisors is an integer number (4111995).

Almost surely, 2^8223989 is an apocalyptic number.

It is an amenable number.

8223989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8223989 is an equidigital number, since it uses as much as digits as its factorization.

8223989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 8223989 is about 2867.7498147502. The cubic root of 8223989 is about 201.8494205050.

It can be divided in two parts, 82239 and 89, that added together give a palindrome (82328).

The spelling of 8223989 in words is "eight million, two hundred twenty-three thousand, nine hundred eighty-nine".