18243903 has 8 divisors (see below), whose sum is σ = 25110016. Its totient is φ = 11770200.

The previous prime is 18243881. The next prime is 18243913. The reversal of 18243903 is 30934281.

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

It is not a de Polignac number, because 18243903 - 2¹⁸ = 17981759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243913) 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, 97993 + ... + 98178.

It is an arithmetic number, because the mean of its divisors is an integer number (3138752).

Almost surely, 2^18243903 is an apocalyptic number.

18243903 is a deficient number, since it is larger than the sum of its proper divisors (6866113).

18243903 is a wasteful number, since it uses less digits than its factorization.

18243903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196205.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 18243903 is about 4271.2882131741. The cubic root of 18243903 is about 263.2525488814.

The spelling of 18243903 in words is "eighteen million, two hundred forty-three thousand, nine hundred three".