18055503 has 12 divisors (see below), whose sum is σ = 26117208. Its totient is φ = 12019920.

The previous prime is 18055493. The next prime is 18055507. The reversal of 18055503 is 30555081.

It is not a de Polignac number, because 18055503 - 2⁶ = 18055439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18055507) 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 11 ways as a sum of consecutive naturals, for example, 10708 + ... + 12278.

It is an arithmetic number, because the mean of its divisors is an integer number (2176434).

Almost surely, 2^18055503 is an apocalyptic number.

18055503 is a deficient number, since it is larger than the sum of its proper divisors (8061705).

18055503 is a wasteful number, since it uses less digits than its factorization.

18055503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854 (or 2851 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 18055503 is about 4249.1767437940. The cubic root of 18055503 is about 262.3432315645.

The spelling of 18055503 in words is "eighteen million, fifty-five thousand, five hundred three".