18248809 has 2 divisors, whose sum is σ = 18248810. Its totient is φ = 18248808.

The previous prime is 18248773. The next prime is 18248833. The reversal of 18248809 is 90884281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13395600 + 4853209 = 3660^2 + 2203^2 .

It is a cyclic number.

It is not a de Polignac number, because 18248809 - 2²¹ = 16151657 is a prime.

It is not a weakly prime, because it can be changed into another prime (18248849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9124404 + 9124405.

It is an arithmetic number, because the mean of its divisors is an integer number (9124405).

Almost surely, 2^18248809 is an apocalyptic number.

It is an amenable number.

18248809 is a deficient number, since it is larger than the sum of its proper divisors (1).

18248809 is an equidigital number, since it uses as much as digits as its factorization.

18248809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 18248809 is about 4271.8624743781. The cubic root of 18248809 is about 263.2761440016.

The spelling of 18248809 in words is "eighteen million, two hundred forty-eight thousand, eight hundred nine".