18247709 has 2 divisors, whose sum is σ = 18247710. Its totient is φ = 18247708.

The previous prime is 18247679. The next prime is 18247721. The reversal of 18247709 is 90774281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11539609 + 6708100 = 3397^2 + 2590^2 .

It is a cyclic number.

It is not a de Polignac number, because 18247709 - 2²⁴ = 1470493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18247769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9123854 + 9123855.

It is an arithmetic number, because the mean of its divisors is an integer number (9123855).

Almost surely, 2^18247709 is an apocalyptic number.

It is an amenable number.

18247709 is a deficient number, since it is larger than the sum of its proper divisors (1).

18247709 is an equidigital number, since it uses as much as digits as its factorization.

18247709 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 18247709 is about 4271.7337229748. The cubic root of 18247709 is about 263.2708539837.

The spelling of 18247709 in words is "eighteen million, two hundred forty-seven thousand, seven hundred nine".