18455225 has 12 divisors (see below), whose sum is σ = 23114220. Its totient is φ = 14616000.

The previous prime is 18455221. The next prime is 18455249. The reversal of 18455225 is 52255481.

It can be written as a sum of positive squares in 6 ways, for example, as 273529 + 18181696 = 523^2 + 4264^2 .

It is not a de Polignac number, because 18455225 - 2² = 18455221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18455191 and 18455200.

It is not an unprimeable number, because it can be changed into a prime (18455221) 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 11 ways as a sum of consecutive naturals, for example, 1130 + ... + 6179.

It is an arithmetic number, because the mean of its divisors is an integer number (1926185).

Almost surely, 2^18455225 is an apocalyptic number.

It is an amenable number.

18455225 is a deficient number, since it is larger than the sum of its proper divisors (4658995).

18455225 is a wasteful number, since it uses less digits than its factorization.

18455225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7420 (or 7415 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

The square root of 18455225 is about 4295.9544923102. The cubic root of 18455225 is about 264.2650813486.

The spelling of 18455225 in words is "eighteen million, four hundred fifty-five thousand, two hundred twenty-five".