18580225 has 6 divisors (see below), whose sum is σ = 23039510. Its totient is φ = 14864160.

The previous prime is 18580223. The next prime is 18580267. The reversal of 18580225 is 52208581.

It can be written as a sum of positive squares in 3 ways, for example, as 124609 + 18455616 = 353^2 + 4296^2 .

It is not a de Polignac number, because 18580225 - 2¹ = 18580223 is a prime.

It is a super-2 number, since 2×18580225² = 690449522101250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18580223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371580 + ... + 371629.

Almost surely, 2^18580225 is an apocalyptic number.

It is an amenable number.

18580225 is a deficient number, since it is larger than the sum of its proper divisors (4459285).

18580225 is an equidigital number, since it uses as much as digits as its factorization.

18580225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743219 (or 743214 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 18580225 is about 4310.4785117200. The cubic root of 18580225 is about 264.8603750046.

The spelling of 18580225 in words is "eighteen million, five hundred eighty thousand, two hundred twenty-five".