18418859 has 8 divisors (see below), whose sum is σ = 18992400. Its totient is φ = 17849376.

The previous prime is 18418831. The next prime is 18418861. The reversal of 18418859 is 95881481.

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 18418859 - 2¹² = 18414763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18418819) 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, 9992 + ... + 11690.

It is an arithmetic number, because the mean of its divisors is an integer number (2374050).

Almost surely, 2^18418859 is an apocalyptic number.

18418859 is a deficient number, since it is larger than the sum of its proper divisors (573541).

18418859 is a wasteful number, since it uses less digits than its factorization.

18418859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029.

The product of its digits is 92160, while the sum is 44.

The square root of 18418859 is about 4291.7198184411. The cubic root of 18418859 is about 264.0913891972.

The spelling of 18418859 in words is "eighteen million, four hundred eighteen thousand, eight hundred fifty-nine".