18305669 has 2 divisors, whose sum is σ = 18305670. Its totient is φ = 18305668.

The previous prime is 18305663. The next prime is 18305711. The reversal of 18305669 is 96650381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15697444 + 2608225 = 3962^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 18305669 - 2¹² = 18301573 is a prime.

It is a super-2 number, since 2×18305669² = 670195035075122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (18305663) 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, 9152834 + 9152835.

It is an arithmetic number, because the mean of its divisors is an integer number (9152835).

Almost surely, 2^18305669 is an apocalyptic number.

It is an amenable number.

18305669 is a deficient number, since it is larger than the sum of its proper divisors (1).

18305669 is an equidigital number, since it uses as much as digits as its factorization.

18305669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 18305669 is about 4278.5124751483. The cubic root of 18305669 is about 263.5493008341.

The spelling of 18305669 in words is "eighteen million, three hundred five thousand, six hundred sixty-nine".