18123808 has 24 divisors (see below), whose sum is σ = 35821548. Its totient is φ = 9026304.

The previous prime is 18123779. The next prime is 18123817. The reversal of 18123808 is 80832181.

It can be written as a sum of positive squares in 2 ways, for example, as 15776784 + 2347024 = 3972^2 + 1532^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18123808.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8410 + ... + 10342.

Almost surely, 2^18123808 is an apocalyptic number.

It is an amenable number.

18123808 is a deficient number, since it is larger than the sum of its proper divisors (17697740).

18123808 is a wasteful number, since it uses less digits than its factorization.

18123808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236 (or 2228 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 18123808 is about 4257.2065958795. The cubic root of 18123808 is about 262.6736350830.

Adding to 18123808 its reverse (80832181), we get a palindrome (98955989).

It can be divided in two parts, 1812 and 3808, that multiplied together give a palindrome (6900096).

The spelling of 18123808 in words is "eighteen million, one hundred twenty-three thousand, eight hundred eight".