16005809 has 8 divisors (see below), whose sum is σ = 17007840. Its totient is φ = 15019776.

The previous prime is 16005797. The next prime is 16005811. The reversal of 16005809 is 90850061.

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

It is a cyclic number.

It is not a de Polignac number, because 16005809 - 2⁸ = 16005553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16005839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1904 + ... + 5969.

It is an arithmetic number, because the mean of its divisors is an integer number (2125980).

Almost surely, 2^16005809 is an apocalyptic number.

16005809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16005809 is a deficient number, since it is larger than the sum of its proper divisors (1002031).

16005809 is a wasteful number, since it uses less digits than its factorization.

16005809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7999.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 16005809 is about 4000.7260591048. The cubic root of 16005809 is about 252.0147016282.

The spelling of 16005809 in words is "sixteen million, five thousand, eight hundred nine".