16816005 has 20 divisors (see below), whose sum is σ = 30144972. Its totient is φ = 8968320.

The previous prime is 16816001. The next prime is 16816021. The reversal of 16816005 is 50061861.

It can be written as a sum of positive squares in 2 ways, for example, as 10556001 + 6260004 = 3249^2 + 2502^2 .

It is not a de Polignac number, because 16816005 - 2² = 16816001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 16816005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16816001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20356 + ... + 21165.

Almost surely, 2^16816005 is an apocalyptic number.

16816005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16816005 is a deficient number, since it is larger than the sum of its proper divisors (13328967).

16816005 is an equidigital number, since it uses as much as digits as its factorization.

16816005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41538 (or 41529 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 16816005 is about 4100.7322516838. The cubic root of 16816005 is about 256.1971392054.

Adding to 16816005 its reverse (50061861), we get a palindrome (66877866).

The spelling of 16816005 in words is "sixteen million, eight hundred sixteen thousand, five".