18108225 has 48 divisors (see below), whose sum is σ = 33678400. Its totient is φ = 9538560.

The previous prime is 18108217. The next prime is 18108227. The reversal of 18108225 is 52280181.

It is not a de Polignac number, because 18108225 - 2³ = 18108217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18108227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93729 + ... + 93921.

Almost surely, 2^18108225 is an apocalyptic number.

18108225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18108225 is a deficient number, since it is larger than the sum of its proper divisors (15570175).

18108225 is a wasteful number, since it uses less digits than its factorization.

18108225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18108225 is about 4255.3760115882. The cubic root of 18108225 is about 262.5983305085.

The spelling of 18108225 in words is "eighteen million, one hundred eight thousand, two hundred twenty-five".