18304709 has 2 divisors, whose sum is σ = 18304710. Its totient is φ = 18304708.

The previous prime is 18304687. The next prime is 18304717. The reversal of 18304709 is 90740381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16120225 + 2184484 = 4015^2 + 1478^2 .

It is an emirp because it is prime and its reverse (90740381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18304709 - 2¹² = 18300613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18304739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152354 + 9152355.

It is an arithmetic number, because the mean of its divisors is an integer number (9152355).

Almost surely, 2^18304709 is an apocalyptic number.

It is an amenable number.

18304709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18304709 is an equidigital number, since it uses as much as digits as its factorization.

18304709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18304709 is about 4278.4002851533. The cubic root of 18304709 is about 263.5446936684.

The spelling of 18304709 in words is "eighteen million, three hundred four thousand, seven hundred nine".