18730109 has 2 divisors, whose sum is σ = 18730110. Its totient is φ = 18730108.

The previous prime is 18730093. The next prime is 18730133. The reversal of 18730109 is 90103781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17724100 + 1006009 = 4210^2 + 1003^2 .

It is a cyclic number.

It is not a de Polignac number, because 18730109 - 2⁴ = 18730093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18730009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365054 + 9365055.

It is an arithmetic number, because the mean of its divisors is an integer number (9365055).

Almost surely, 2^18730109 is an apocalyptic number.

It is an amenable number.

18730109 is a deficient number, since it is larger than the sum of its proper divisors (1).

18730109 is an equidigital number, since it uses as much as digits as its factorization.

18730109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 18730109 is about 4327.8295946121. The cubic root of 18730109 is about 265.5706653154.

The spelling of 18730109 in words is "eighteen million, seven hundred thirty thousand, one hundred nine".