18618208 has 24 divisors (see below), whose sum is σ = 41891472. Its totient is φ = 7979136.

The previous prime is 18618199. The next prime is 18618209. The reversal of 18618208 is 80281681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618209) 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, 41335 + ... + 41782.

It is an arithmetic number, because the mean of its divisors is an integer number (1745478).

Almost surely, 2^18618208 is an apocalyptic number.

It is an amenable number.

18618208 is an abundant number, since it is smaller than the sum of its proper divisors (23273264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18618208 is an equidigital number, since it uses as much as digits as its factorization.

18618208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83134 (or 83126 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 18618208 is about 4314.8821536631. The cubic root of 18618208 is about 265.0407342153.

Adding to 18618208 its reverse (80281681), we get a palindrome (98899889).

The spelling of 18618208 in words is "eighteen million, six hundred eighteen thousand, two hundred eight".