18218325 has 12 divisors (see below), whose sum is σ = 30121088. Its totient is φ = 9716400.

The previous prime is 18218311. The next prime is 18218327. The reversal of 18218325 is 52381281.

It is not a de Polignac number, because 18218325 - 2⁶ = 18218261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18218292 and 18218301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18218327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121381 + ... + 121530.

Almost surely, 2^18218325 is an apocalyptic number.

18218325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18218325 is a deficient number, since it is larger than the sum of its proper divisors (11902763).

18218325 is a wasteful number, since it uses less digits than its factorization.

18218325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242924 (or 242919 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 18218325 is about 4268.2929843205. The cubic root of 18218325 is about 263.1294644199.

The spelling of 18218325 in words is "eighteen million, two hundred eighteen thousand, three hundred twenty-five".