18223259 has 2 divisors, whose sum is σ = 18223260. Its totient is φ = 18223258.

The previous prime is 18223241. The next prime is 18223267. The reversal of 18223259 is 95232281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18223259 - 2⁸ = 18223003 is a prime.

It is not a weakly prime, because it can be changed into another prime (18223159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111629 + 9111630.

It is an arithmetic number, because the mean of its divisors is an integer number (9111630).

Almost surely, 2^18223259 is an apocalyptic number.

18223259 is a deficient number, since it is larger than the sum of its proper divisors (1).

18223259 is an equidigital number, since it uses as much as digits as its factorization.

18223259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 18223259 is about 4268.8709280090. The cubic root of 18223259 is about 263.1532163947.

The spelling of 18223259 in words is "eighteen million, two hundred twenty-three thousand, two hundred fifty-nine".