18281325 has 24 divisors (see below), whose sum is σ = 31818400. Its totient is φ = 9236160.

The previous prime is 18281309. The next prime is 18281353. The reversal of 18281325 is 52318281.

It is not a de Polignac number, because 18281325 - 2⁴ = 18281309 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18281292 and 18281301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4990 + ... + 7839.

Almost surely, 2^18281325 is an apocalyptic number.

18281325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18281325 is a deficient number, since it is larger than the sum of its proper divisors (13537075).

18281325 is a wasteful number, since it uses less digits than its factorization.

18281325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12861 (or 12856 counting only the distinct ones).

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

The square root of 18281325 is about 4275.6666146930. Note that the first 4 decimals coincide. The cubic root of 18281325 is about 263.4324210059.

The spelling of 18281325 in words is "eighteen million, two hundred eighty-one thousand, three hundred twenty-five".