16689609 has 12 divisors (see below), whose sum is σ = 24211200. Its totient is φ = 11078424.

The previous prime is 16689599. The next prime is 16689611. The reversal of 16689609 is 90698661.

It is not a de Polignac number, because 16689609 - 2⁴ = 16689593 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16689649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1729 + ... + 6030.

It is an arithmetic number, because the mean of its divisors is an integer number (2017600).

Almost surely, 2^16689609 is an apocalyptic number.

It is an amenable number.

16689609 is a deficient number, since it is larger than the sum of its proper divisors (7521591).

16689609 is a wasteful number, since it uses less digits than its factorization.

16689609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8004 (or 8001 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 16689609 is about 4085.2917888445. The cubic root of 16689609 is about 255.5536299022.

The spelling of 16689609 in words is "sixteen million, six hundred eighty-nine thousand, six hundred nine".