18257225 has 12 divisors (see below), whose sum is σ = 25873344. Its totient is φ = 12519120.

The previous prime is 18257207. The next prime is 18257249. The reversal of 18257225 is 52275281.

It is a happy number.

It is not a de Polignac number, because 18257225 - 2⁸ = 18256969 is a prime.

It is a super-4 number, since 4×18257225⁴ (a number of 30 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18257191 and 18257200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51989 + ... + 52338.

It is an arithmetic number, because the mean of its divisors is an integer number (2156112).

Almost surely, 2^18257225 is an apocalyptic number.

It is an amenable number.

18257225 is a deficient number, since it is larger than the sum of its proper divisors (7616119).

18257225 is a wasteful number, since it uses less digits than its factorization.

18257225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104344 (or 104339 counting only the distinct ones).

The product of its digits is 11200, while the sum is 32.

The square root of 18257225 is about 4272.8474112704. The cubic root of 18257225 is about 263.3166104141.

The spelling of 18257225 in words is "eighteen million, two hundred fifty-seven thousand, two hundred twenty-five".