18473218 has 8 divisors (see below), whose sum is σ = 27784080. Its totient is φ = 9211860.

The previous prime is 18473197. The next prime is 18473219. The reversal of 18473218 is 81237481.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (18473219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11428 + ... + 12943.

It is an arithmetic number, because the mean of its divisors is an integer number (3473010).

Almost surely, 2^18473218 is an apocalyptic number.

18473218 is a deficient number, since it is larger than the sum of its proper divisors (9310862).

18473218 is a wasteful number, since it uses less digits than its factorization.

18473218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24752.

The product of its digits is 10752, while the sum is 34.

The square root of 18473218 is about 4298.0481616659. The cubic root of 18473218 is about 264.3509355745.

The spelling of 18473218 in words is "eighteen million, four hundred seventy-three thousand, two hundred eighteen".