18005525 has 6 divisors (see below), whose sum is σ = 22326882. Its totient is φ = 14404400.

The previous prime is 18005509. The next prime is 18005563. The reversal of 18005525 is 52550081.

It can be written as a sum of positive squares in 3 ways, for example, as 2053489 + 15952036 = 1433^2 + 3994^2 .

It is not a de Polignac number, because 18005525 - 2⁴ = 18005509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 18005494 and 18005503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360086 + ... + 360135.

It is an arithmetic number, because the mean of its divisors is an integer number (3721147).

Almost surely, 2^18005525 is an apocalyptic number.

It is an amenable number.

18005525 is a deficient number, since it is larger than the sum of its proper divisors (4321357).

18005525 is an equidigital number, since it uses as much as digits as its factorization.

18005525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720231 (or 720226 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 18005525 is about 4243.2917646563. The cubic root of 18005525 is about 262.1009507449.

The spelling of 18005525 in words is "eighteen million, five thousand, five hundred twenty-five".