18240303 has 8 divisors (see below), whose sum is σ = 25751088. Its totient is φ = 11444864.

The previous prime is 18240301. The next prime is 18240331. The reversal of 18240303 is 30304281.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 18240303 - 2¹ = 18240301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18240303.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178776 + ... + 178877.

It is an arithmetic number, because the mean of its divisors is an integer number (3218886).

Almost surely, 2^18240303 is an apocalyptic number.

18240303 is a deficient number, since it is larger than the sum of its proper divisors (7510785).

18240303 is a wasteful number, since it uses less digits than its factorization.

18240303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357673.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 18240303 is about 4270.8667738528. The cubic root of 18240303 is about 263.2352322009.

Adding to 18240303 its reverse (30304281), we get a palindrome (48544584).

The spelling of 18240303 in words is "eighteen million, two hundred forty thousand, three hundred three".