18396225 has 18 divisors (see below), whose sum is σ = 32950086. Its totient is φ = 9811200.

The previous prime is 18396221. The next prime is 18396229. The reversal of 18396225 is 52269381.

It is an interprime number because it is at equal distance from previous prime (18396221) and next prime (18396229).

It can be written as a sum of positive squares in 3 ways, for example, as 831744 + 17564481 = 912^2 + 4191^2 .

It is not a de Polignac number, because 18396225 - 2² = 18396221 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18396225.

It is not an unprimeable number, because it can be changed into a prime (18396221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40656 + ... + 41105.

Almost surely, 2^18396225 is an apocalyptic number.

18396225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18396225 is a deficient number, since it is larger than the sum of its proper divisors (14553861).

18396225 is a wasteful number, since it uses less digits than its factorization.

18396225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81777 (or 81769 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 18396225 is about 4289.0820696275. The cubic root of 18396225 is about 263.9831686928.

The spelling of 18396225 in words is "eighteen million, three hundred ninety-six thousand, two hundred twenty-five".