18305449 has 2 divisors, whose sum is σ = 18305450. Its totient is φ = 18305448.

The previous prime is 18305423. The next prime is 18305459. The reversal of 18305449 is 94450381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15642025 + 2663424 = 3955^2 + 1632^2 .

It is a cyclic number.

It is not a de Polignac number, because 18305449 - 2¹⁹ = 17781161 is a prime.

It is not a weakly prime, because it can be changed into another prime (18305459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152724 + 9152725.

It is an arithmetic number, because the mean of its divisors is an integer number (9152725).

Almost surely, 2^18305449 is an apocalyptic number.

It is an amenable number.

18305449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18305449 is an equidigital number, since it uses as much as digits as its factorization.

18305449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18305449 is about 4278.4867652010. The cubic root of 18305449 is about 263.5482450395.

The spelling of 18305449 in words is "eighteen million, three hundred five thousand, four hundred forty-nine".