18725585 has 8 divisors (see below), whose sum is σ = 23792616. Its totient is φ = 14099200.

The previous prime is 18725579. The next prime is 18725587. The reversal of 18725585 is 58552781.

It can be written as a sum of positive squares in 4 ways, for example, as 5650129 + 13075456 = 2377^2 + 3616^2 .

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

It is not a de Polignac number, because 18725585 - 2¹⁰ = 18724561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18725587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110066 + ... + 110235.

It is an arithmetic number, because the mean of its divisors is an integer number (2974077).

Almost surely, 2^18725585 is an apocalyptic number.

It is an amenable number.

18725585 is a deficient number, since it is larger than the sum of its proper divisors (5067031).

18725585 is a wasteful number, since it uses less digits than its factorization.

18725585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220323.

The product of its digits is 112000, while the sum is 41.

The square root of 18725585 is about 4327.3068992157. The cubic root of 18725585 is about 265.5492819476.

The spelling of 18725585 in words is "eighteen million, seven hundred twenty-five thousand, five hundred eighty-five".