18226259 has 2 divisors, whose sum is σ = 18226260. Its totient is φ = 18226258.

The previous prime is 18226249. The next prime is 18226277. The reversal of 18226259 is 95262281.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18226259 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18226249) 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, 9113129 + 9113130.

It is an arithmetic number, because the mean of its divisors is an integer number (9113130).

Almost surely, 2^18226259 is an apocalyptic number.

18226259 is a deficient number, since it is larger than the sum of its proper divisors (1).

18226259 is an equidigital number, since it uses as much as digits as its factorization.

18226259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 18226259 is about 4269.2222945169. Note that the first 4 decimals coincide. The cubic root of 18226259 is about 263.1676561158.

The spelling of 18226259 in words is "eighteen million, two hundred twenty-six thousand, two hundred fifty-nine".