16689909 has 8 divisors (see below), whose sum is σ = 22284640. Its totient is φ = 11110896.

The previous prime is 16689887. The next prime is 16689913. The reversal of 16689909 is 90998661.

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

It is not a de Polignac number, because 16689909 - 2⁹ = 16689397 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16689919) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1174 + ... + 5895.

It is an arithmetic number, because the mean of its divisors is an integer number (2785580).

Almost surely, 2^16689909 is an apocalyptic number.

It is an amenable number.

16689909 is a deficient number, since it is larger than the sum of its proper divisors (5594731).

16689909 is an equidigital number, since it uses as much as digits as its factorization.

16689909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7859.

The product of its (nonzero) digits is 209952, while the sum is 48.

The square root of 16689909 is about 4085.3285057630. The cubic root of 16689909 is about 255.5551611070. Note that the first 3 decimals are identical.

Adding to 16689909 its product of nonzero digits (209952), we get a palindrome (16899861).

The spelling of 16689909 in words is "sixteen million, six hundred eighty-nine thousand, nine hundred nine".