18045225 has 72 divisors (see below), whose sum is σ = 36908352. Its totient is φ = 8342400.

The previous prime is 18045199. The next prime is 18045253. The reversal of 18045225 is 52254081.

It is a happy number.

It is not a de Polignac number, because 18045225 - 2⁸ = 18044969 is a prime.

It is a Curzon number.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 56767 + ... + 57083.

It is an arithmetic number, because the mean of its divisors is an integer number (512616).

Almost surely, 2^18045225 is an apocalyptic number.

18045225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18045225 is an abundant number, since it is smaller than the sum of its proper divisors (18863127).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18045225 is a wasteful number, since it uses less digits than its factorization.

18045225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 18045225 is about 4247.9671608900. The cubic root of 18045225 is about 262.2934429484.

Subtracting 18045225 from its reverse (52254081), we obtain a triangular number (34208856 = T₈₂₇₁).

The spelling of 18045225 in words is "eighteen million, forty-five thousand, two hundred twenty-five".