16680309 has 16 divisors (see below), whose sum is σ = 23505600. Its totient is φ = 10492416.

The previous prime is 16680289. The next prime is 16680311. The reversal of 16680309 is 90308661.

It is not a de Polignac number, because 16680309 - 2⁹ = 16679797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16680309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16680509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19707 + ... + 20535.

It is an arithmetic number, because the mean of its divisors is an integer number (1469100).

Almost surely, 2^16680309 is an apocalyptic number.

16680309 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16680309 is a deficient number, since it is larger than the sum of its proper divisors (6825291).

16680309 is a wasteful number, since it uses less digits than its factorization.

16680309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 16680309 is about 4084.1534006450. The cubic root of 16680309 is about 255.5061534485.

The spelling of 16680309 in words is "sixteen million, six hundred eighty thousand, three hundred nine".