16918809 has 8 divisors (see below), whose sum is σ = 22577952. Its totient is φ = 11269440.

The previous prime is 16918807. The next prime is 16918841. The reversal of 16918809 is 90881961.

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

It is not a de Polignac number, because 16918809 - 2¹ = 16918807 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16918807) 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, 4114 + ... + 7124.

It is an arithmetic number, because the mean of its divisors is an integer number (2822244).

Almost surely, 2^16918809 is an apocalyptic number.

It is an amenable number.

16918809 is a deficient number, since it is larger than the sum of its proper divisors (5659143).

16918809 is a wasteful number, since it uses less digits than its factorization.

16918809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4887.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 16918809 is about 4113.2479866889. The cubic root of 16918809 is about 256.7181626777.

The spelling of 16918809 in words is "sixteen million, nine hundred eighteen thousand, eight hundred nine".