18274709 has 2 divisors, whose sum is σ = 18274710. Its totient is φ = 18274708.

The previous prime is 18274693. The next prime is 18274721. The reversal of 18274709 is 90747281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17455684 + 819025 = 4178^2 + 905^2 .

It is an emirp because it is prime and its reverse (90747281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18274709 - 2⁴ = 18274693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18274759) 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, 9137354 + 9137355.

It is an arithmetic number, because the mean of its divisors is an integer number (9137355).

Almost surely, 2^18274709 is an apocalyptic number.

It is an amenable number.

18274709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18274709 is an equidigital number, since it uses as much as digits as its factorization.

18274709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 18274709 is about 4274.8928641546. The cubic root of 18274709 is about 263.4006384958.

The spelling of 18274709 in words is "eighteen million, two hundred seventy-four thousand, seven hundred nine".