18418609 has 8 divisors (see below), whose sum is σ = 20125728. Its totient is φ = 16716960.

The previous prime is 18418591. The next prime is 18418627. The reversal of 18418609 is 90681481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18418591) and next prime (18418627).

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 18418609 - 2¹¹ = 18416561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18418649) 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 7 ways as a sum of consecutive naturals, for example, 9414 + ... + 11200.

It is an arithmetic number, because the mean of its divisors is an integer number (2515716).

Almost surely, 2^18418609 is an apocalyptic number.

It is an amenable number.

18418609 is a deficient number, since it is larger than the sum of its proper divisors (1707119).

18418609 is a wasteful number, since it uses less digits than its factorization.

18418609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 18418609 is about 4291.6906924894. The cubic root of 18418609 is about 264.0901943504.

The spelling of 18418609 in words is "eighteen million, four hundred eighteen thousand, six hundred nine".