18480559 has 4 divisors (see below), whose sum is σ = 19453240. Its totient is φ = 17507880.

The previous prime is 18480503. The next prime is 18480571. The reversal of 18480559 is 95508481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18480559 - 2¹³ = 18472367 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 (18480589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486312 + ... + 486349.

It is an arithmetic number, because the mean of its divisors is an integer number (4863310).

Almost surely, 2^18480559 is an apocalyptic number.

18480559 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18480559 is a deficient number, since it is larger than the sum of its proper divisors (972681).

18480559 is an equidigital number, since it uses as much as digits as its factorization.

18480559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972680.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 18480559 is about 4298.9020691335. The cubic root of 18480559 is about 264.3859473994.

The spelling of 18480559 in words is "eighteen million, four hundred eighty thousand, five hundred fifty-nine".