16689447 has 6 divisors (see below), whose sum is σ = 24106992. Its totient is φ = 11126292.

The previous prime is 16689443. The next prime is 16689481. The reversal of 16689447 is 74498661.

It is not a de Polignac number, because 16689447 - 2² = 16689443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16689443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 927183 + ... + 927200.

It is an arithmetic number, because the mean of its divisors is an integer number (4017832).

Almost surely, 2^16689447 is an apocalyptic number.

16689447 is a deficient number, since it is larger than the sum of its proper divisors (7417545).

16689447 is a wasteful number, since it uses less digits than its factorization.

16689447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854389 (or 1854386 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 16689447 is about 4085.2719615712. The cubic root of 16689447 is about 255.5528030439.

The spelling of 16689447 in words is "sixteen million, six hundred eighty-nine thousand, four hundred forty-seven".