19993223 has 2 divisors, whose sum is σ = 19993224. Its totient is φ = 19993222.

The previous prime is 19993219. The next prime is 19993249. The reversal of 19993223 is 32239991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19993223 - 2² = 19993219 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19993273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996611 + 9996612.

It is an arithmetic number, because the mean of its divisors is an integer number (9996612).

Almost surely, 2^19993223 is an apocalyptic number.

19993223 is a deficient number, since it is larger than the sum of its proper divisors (1).

19993223 is an equidigital number, since it uses as much as digits as its factorization.

19993223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 38.

The square root of 19993223 is about 4471.3781991686. The cubic root of 19993223 is about 271.4110988489.

The spelling of 19993223 in words is "nineteen million, nine hundred ninety-three thousand, two hundred twenty-three".