19973227 has 2 divisors, whose sum is σ = 19973228. Its totient is φ = 19973226.

The previous prime is 19973221. The next prime is 19973231. The reversal of 19973227 is 72237991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19973227 - 2⁷ = 19973099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19973227.

It is not a weakly prime, because it can be changed into another prime (19973221) 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, 9986613 + 9986614.

It is an arithmetic number, because the mean of its divisors is an integer number (9986614).

Almost surely, 2^19973227 is an apocalyptic number.

19973227 is a deficient number, since it is larger than the sum of its proper divisors (1).

19973227 is an equidigital number, since it uses as much as digits as its factorization.

19973227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 40.

The square root of 19973227 is about 4469.1416401810. The cubic root of 19973227 is about 271.3205857346.

The spelling of 19973227 in words is "nineteen million, nine hundred seventy-three thousand, two hundred twenty-seven".