18123208 has 16 divisors (see below), whose sum is σ = 34068060. Its totient is φ = 9038400.

The previous prime is 18123197. The next prime is 18123211. The reversal of 18123208 is 80232181.

It can be written as a sum of positive squares in 2 ways, for example, as 14730244 + 3392964 = 3838^2 + 1842^2 .

It is a super-3 number, since 3×18123208³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 678 + ... + 6058.

Almost surely, 2^18123208 is an apocalyptic number.

It is an amenable number.

18123208 is a deficient number, since it is larger than the sum of its proper divisors (15944852).

18123208 is a wasteful number, since it uses less digits than its factorization.

18123208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5808 (or 5804 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 18123208 is about 4257.1361265527. The cubic root of 18123208 is about 262.6707363927.

Adding to 18123208 its reverse (80232181), we get a palindrome (98355389).

The spelling of 18123208 in words is "eighteen million, one hundred twenty-three thousand, two hundred eight".