18006305 has 8 divisors (see below), whose sum is σ = 21660072. Its totient is φ = 14370048.

The previous prime is 18006299. The next prime is 18006323. The reversal of 18006305 is 50360081.

It can be written as a sum of positive squares in 4 ways, for example, as 3083536 + 14922769 = 1756^2 + 3863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18006305 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1994 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (2707509).

Almost surely, 2^18006305 is an apocalyptic number.

It is an amenable number.

18006305 is a deficient number, since it is larger than the sum of its proper divisors (3653767).

18006305 is an equidigital number, since it uses as much as digits as its factorization.

18006305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8755.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 18006305 is about 4243.3836734380. The cubic root of 18006305 is about 262.1047354312.

Adding to 18006305 its reverse (50360081), we get a palindrome (68366386).

The spelling of 18006305 in words is "eighteen million, six thousand, three hundred five".