16218005 has 6 divisors (see below), whose sum is σ = 19472418. Its totient is φ = 12967200.

The previous prime is 16217987. The next prime is 16218019. The reversal of 16218005 is 50081261.

It can be written as a sum of positive squares in 3 ways, for example, as 145924 + 16072081 = 382^2 + 4009^2 .

It is not a de Polignac number, because 16218005 - 2¹⁴ = 16201621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8105 + ... + 9905.

It is an arithmetic number, because the mean of its divisors is an integer number (3245403).

Almost surely, 2^16218005 is an apocalyptic number.

It is an amenable number.

16218005 is a deficient number, since it is larger than the sum of its proper divisors (3254413).

16218005 is an frugal number, since it uses more digits than its factorization.

16218005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 16218005 is about 4027.1584274771. The cubic root of 16218005 is about 253.1235056560.

Adding to 16218005 its reverse (50081261), we get a palindrome (66299266).

The spelling of 16218005 in words is "sixteen million, two hundred eighteen thousand, five".