16809644 has 12 divisors (see below), whose sum is σ = 30043104. Its totient is φ = 8225904.

The previous prime is 16809643. The next prime is 16809649. The reversal of 16809644 is 44690861.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16809598 and 16809607.

It is not an unprimeable number, because it can be changed into a prime (16809641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44519 + ... + 44894.

It is an arithmetic number, because the mean of its divisors is an integer number (2503592).

Almost surely, 2^16809644 is an apocalyptic number.

It is an amenable number.

16809644 is a deficient number, since it is larger than the sum of its proper divisors (13233460).

16809644 is a wasteful number, since it uses less digits than its factorization.

16809644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89464 (or 89462 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 16809644 is about 4099.9565851360. The cubic root of 16809644 is about 256.1648311843.

The spelling of 16809644 in words is "sixteen million, eight hundred nine thousand, six hundred forty-four".