18452209 has 2 divisors, whose sum is σ = 18452210. Its totient is φ = 18452208.

The previous prime is 18452201. The next prime is 18452221. The reversal of 18452209 is 90225481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 5184 = 4295^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 18452209 - 2³ = 18452201 is a prime.

It is not a weakly prime, because it can be changed into another prime (18452201) 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, 9226104 + 9226105.

It is an arithmetic number, because the mean of its divisors is an integer number (9226105).

Almost surely, 2^18452209 is an apocalyptic number.

It is an amenable number.

18452209 is a deficient number, since it is larger than the sum of its proper divisors (1).

18452209 is an equidigital number, since it uses as much as digits as its factorization.

18452209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 18452209 is about 4295.6034500405. The cubic root of 18452209 is about 264.2506849395.

The spelling of 18452209 in words is "eighteen million, four hundred fifty-two thousand, two hundred nine".