18409117 has 8 divisors (see below), whose sum is σ = 18935840. Its totient is φ = 17886960.

The previous prime is 18409109. The next prime is 18409163. The reversal of 18409117 is 71190481.

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 18409117 - 2³ = 18409109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18409817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8059 + ... + 10087.

It is an arithmetic number, because the mean of its divisors is an integer number (2366980).

Almost surely, 2^18409117 is an apocalyptic number.

It is an amenable number.

18409117 is a deficient number, since it is larger than the sum of its proper divisors (526723).

18409117 is a wasteful number, since it uses less digits than its factorization.

18409117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 18409117 is about 4290.5846920903. The cubic root of 18409117 is about 264.0448204052.

Adding to 18409117 its reverse (71190481), we get a palindrome (89599598).

The spelling of 18409117 in words is "eighteen million, four hundred nine thousand, one hundred seventeen".