18240227 has 2 divisors, whose sum is σ = 18240228. Its totient is φ = 18240226.

The previous prime is 18240221. The next prime is 18240239. The reversal of 18240227 is 72204281.

It is a weak prime.

It is an emirp because it is prime and its reverse (72204281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18240227 - 2¹⁰ = 18239203 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18240196 and 18240205.

It is not a weakly prime, because it can be changed into another prime (18240221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9120113 + 9120114.

It is an arithmetic number, because the mean of its divisors is an integer number (9120114).

Almost surely, 2^18240227 is an apocalyptic number.

18240227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18240227 is an equidigital number, since it uses as much as digits as its factorization.

18240227 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 18240227 is about 4270.8578763522. The cubic root of 18240227 is about 263.2348666020.

The spelling of 18240227 in words is "eighteen million, two hundred forty thousand, two hundred twenty-seven".