16404809 has 8 divisors (see below), whose sum is σ = 17377440. Its totient is φ = 15443136.

The previous prime is 16404803. The next prime is 16404811. The reversal of 16404809 is 90840461.

16404809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 16404809 - 2⁴ = 16404793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16404803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449 + ... + 5745.

It is an arithmetic number, because the mean of its divisors is an integer number (2172180).

Almost surely, 2^16404809 is an apocalyptic number.

16404809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

16404809 is a deficient number, since it is larger than the sum of its proper divisors (972631).

16404809 is a wasteful number, since it uses less digits than its factorization.

16404809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5479.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 16404809 is about 4050.2850516970. The cubic root of 16404809 is about 254.0916496099.

The spelling of 16404809 in words is "sixteen million, four hundred four thousand, eight hundred nine".