18900223 has 2 divisors, whose sum is σ = 18900224. Its totient is φ = 18900222.

The previous prime is 18900187. The next prime is 18900239. The reversal of 18900223 is 32200981.

It is a strong prime.

It is an emirp because it is prime and its reverse (32200981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18900223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18900253) 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, 9450111 + 9450112.

It is an arithmetic number, because the mean of its divisors is an integer number (9450112).

Almost surely, 2^18900223 is an apocalyptic number.

18900223 is a deficient number, since it is larger than the sum of its proper divisors (1).

18900223 is an equidigital number, since it uses as much as digits as its factorization.

18900223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18900223 is about 4347.4386712178. The cubic root of 18900223 is about 266.3722481514.

The spelling of 18900223 in words is "eighteen million, nine hundred thousand, two hundred twenty-three".