18240308 has 12 divisors (see below), whose sum is σ = 32061540. Its totient is φ = 9079872.

The previous prime is 18240301. The next prime is 18240331. The reversal of 18240308 is 80304281.

It can be written as a sum of positive squares in 2 ways, for example, as 8076964 + 10163344 = 2842^2 + 3188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9041 + ... + 10872.

It is an arithmetic number, because the mean of its divisors is an integer number (2671795).

Almost surely, 2^18240308 is an apocalyptic number.

It is an amenable number.

18240308 is a deficient number, since it is larger than the sum of its proper divisors (13821232).

18240308 is a wasteful number, since it uses less digits than its factorization.

18240308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20146 (or 20144 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18240308 is about 4270.8673592141. The cubic root of 18240308 is about 263.2352562534.

Adding to 18240308 its reverse (80304281), we get a palindrome (98544589).

The spelling of 18240308 in words is "eighteen million, two hundred forty thousand, three hundred eight".