18020459 has 8 divisors (see below), whose sum is σ = 19128960. Its totient is φ = 16917376.

The previous prime is 18020447. The next prime is 18020473. The reversal of 18020459 is 95402081.

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 18020459 - 2⁸ = 18020203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18020479) 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, 7037 + ... + 9249.

It is an arithmetic number, because the mean of its divisors is an integer number (2391120).

Almost surely, 2^18020459 is an apocalyptic number.

18020459 is a deficient number, since it is larger than the sum of its proper divisors (1108501).

18020459 is a wasteful number, since it uses less digits than its factorization.

18020459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 18020459 is about 4245.0511186557. The cubic root of 18020459 is about 262.1733939520.

The spelling of 18020459 in words is "eighteen million, twenty thousand, four hundred fifty-nine".