18019223 has 2 divisors, whose sum is σ = 18019224. Its totient is φ = 18019222.

The previous prime is 18019159. The next prime is 18019229. The reversal of 18019223 is 32291081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18019223 - 2⁶ = 18019159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18019192 and 18019201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18019229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9009611 + 9009612.

It is an arithmetic number, because the mean of its divisors is an integer number (9009612).

Almost surely, 2^18019223 is an apocalyptic number.

18019223 is a deficient number, since it is larger than the sum of its proper divisors (1).

18019223 is an equidigital number, since it uses as much as digits as its factorization.

18019223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18019223 is about 4244.9055348735. The cubic root of 18019223 is about 262.1673997702.

The spelling of 18019223 in words is "eighteen million, nineteen thousand, two hundred twenty-three".