18704218 has 8 divisors (see below), whose sum is σ = 30214548. Its totient is φ = 8632704.

The previous prime is 18704201. The next prime is 18704243. The reversal of 18704218 is 81240781.

It can be written as a sum of positive squares in 2 ways, for example, as 18122049 + 582169 = 4257^2 + 763^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 18704218.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359671 + ... + 359722.

Almost surely, 2^18704218 is an apocalyptic number.

18704218 is a deficient number, since it is larger than the sum of its proper divisors (11510330).

18704218 is a wasteful number, since it uses less digits than its factorization.

18704218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719408.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18704218 is about 4324.8373379816. The cubic root of 18704218 is about 265.4482410278.

Adding to 18704218 its reverse (81240781), we get a palindrome (99944999).

The spelling of 18704218 in words is "eighteen million, seven hundred four thousand, two hundred eighteen".