18495709 has 2 divisors, whose sum is σ = 18495710. Its totient is φ = 18495708.

The previous prime is 18495691. The next prime is 18495761. The reversal of 18495709 is 90759481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 6140484 = 3515^2 + 2478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18495709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18495209) 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, 9247854 + 9247855.

It is an arithmetic number, because the mean of its divisors is an integer number (9247855).

Almost surely, 2^18495709 is an apocalyptic number.

It is an amenable number.

18495709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18495709 is an equidigital number, since it uses as much as digits as its factorization.

18495709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 18495709 is about 4300.6637859754. The cubic root of 18495709 is about 264.4581738054.

The spelling of 18495709 in words is "eighteen million, four hundred ninety-five thousand, seven hundred nine".