18718585 has 4 divisors (see below), whose sum is σ = 22462308. Its totient is φ = 14974864.

The previous prime is 18718577. The next prime is 18718589. The reversal of 18718585 is 58581781.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58581781 = 43 ⋅1362367.

It can be written as a sum of positive squares in 2 ways, for example, as 7354944 + 11363641 = 2712^2 + 3371^2 .

It is a cyclic number.

It is not a de Polignac number, because 18718585 - 2³ = 18718577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18718589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871854 + ... + 1871863.

It is an arithmetic number, because the mean of its divisors is an integer number (5615577).

Almost surely, 2^18718585 is an apocalyptic number.

It is an amenable number.

18718585 is a deficient number, since it is larger than the sum of its proper divisors (3743723).

18718585 is an equidigital number, since it uses as much as digits as its factorization.

18718585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3743722.

The product of its digits is 89600, while the sum is 43.

The square root of 18718585 is about 4326.4980064713. The cubic root of 18718585 is about 265.5161886041.

The spelling of 18718585 in words is "eighteen million, seven hundred eighteen thousand, five hundred eighty-five".