18466009 has 2 divisors, whose sum is σ = 18466010. Its totient is φ = 18466008.

The previous prime is 18466003. The next prime is 18466039. The reversal of 18466009 is 90066481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 6110784 = 3515^2 + 2472^2 .

It is a cyclic number.

It is not a de Polignac number, because 18466009 - 2³ = 18466001 is a prime.

It is not a weakly prime, because it can be changed into another prime (18466001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9233004 + 9233005.

It is an arithmetic number, because the mean of its divisors is an integer number (9233005).

Almost surely, 2^18466009 is an apocalyptic number.

It is an amenable number.

18466009 is a deficient number, since it is larger than the sum of its proper divisors (1).

18466009 is an equidigital number, since it uses as much as digits as its factorization.

18466009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 18466009 is about 4297.2094433481. The cubic root of 18466009 is about 264.3165442764.

The spelling of 18466009 in words is "eighteen million, four hundred sixty-six thousand, nine".