16809804 has 108 divisors (see below), whose sum is σ = 49670712. Its totient is φ = 4773120.

The previous prime is 16809791. The next prime is 16809811. The reversal of 16809804 is 40890861.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 73939 + ... + 74165.

It is an arithmetic number, because the mean of its divisors is an integer number (459914).

Almost surely, 2^16809804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16809804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24835356).

16809804 is an abundant number, since it is smaller than the sum of its proper divisors (32860908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16809804 is a wasteful number, since it uses less digits than its factorization.

16809804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 16809804 is about 4099.9760974913. The cubic root of 16809804 is about 256.1656439369.

The spelling of 16809804 in words is "sixteen million, eight hundred nine thousand, eight hundred four".