18830809 has 2 divisors, whose sum is σ = 18830810. Its totient is φ = 18830808.

The previous prime is 18830803. The next prime is 18830893. The reversal of 18830809 is 90803881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18731584 + 99225 = 4328^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 18830809 - 2⁷ = 18830681 is a prime.

It is not a weakly prime, because it can be changed into another prime (18830803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9415404 + 9415405.

It is an arithmetic number, because the mean of its divisors is an integer number (9415405).

Almost surely, 2^18830809 is an apocalyptic number.

It is an amenable number.

18830809 is a deficient number, since it is larger than the sum of its proper divisors (1).

18830809 is an equidigital number, since it uses as much as digits as its factorization.

18830809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18830809 is about 4339.4480063713. The cubic root of 18830809 is about 266.0457503233.

The spelling of 18830809 in words is "eighteen million, eight hundred thirty thousand, eight hundred nine".