19989227 has 2 divisors, whose sum is σ = 19989228. Its totient is φ = 19989226.

The previous prime is 19989223. The next prime is 19989239. The reversal of 19989227 is 72298991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19989227 - 2² = 19989223 is a prime.

It is not a weakly prime, because it can be changed into another prime (19989223) 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, 9994613 + 9994614.

It is an arithmetic number, because the mean of its divisors is an integer number (9994614).

Almost surely, 2^19989227 is an apocalyptic number.

19989227 is a deficient number, since it is larger than the sum of its proper divisors (1).

19989227 is an equidigital number, since it uses as much as digits as its factorization.

19989227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 19989227 is about 4470.9313347445. The cubic root of 19989227 is about 271.3930155378.

The spelling of 19989227 in words is "nineteen million, nine hundred eighty-nine thousand, two hundred twenty-seven".