16684309 has 8 divisors (see below), whose sum is σ = 17388000. Its totient is φ = 15989232.

The previous prime is 16684289. The next prime is 16684313. The reversal of 16684309 is 90348661.

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 16684309 - 2⁵ = 16684277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16684319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1962 + ... + 6100.

It is an arithmetic number, because the mean of its divisors is an integer number (2173500).

Almost surely, 2^16684309 is an apocalyptic number.

It is an amenable number.

16684309 is a deficient number, since it is larger than the sum of its proper divisors (703691).

16684309 is a wasteful number, since it uses less digits than its factorization.

16684309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4307.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 16684309 is about 4084.6430688617. The cubic root of 16684309 is about 255.5265755908.

The spelling of 16684309 in words is "sixteen million, six hundred eighty-four thousand, three hundred nine".