18222225 has 48 divisors (see below), whose sum is σ = 35057280. Its totient is φ = 8179200.

The previous prime is 18222223. The next prime is 18222257. The reversal of 18222225 is 52222281.

It is not a de Polignac number, because 18222225 - 2¹ = 18222223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18222195 and 18222204.

It is not an unprimeable number, because it can be changed into a prime (18222223) 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, 31741 + ... + 32309.

It is an arithmetic number, because the mean of its divisors is an integer number (730360).

Almost surely, 2^18222225 is an apocalyptic number.

18222225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18222225 is a deficient number, since it is larger than the sum of its proper divisors (16835055).

18222225 is a wasteful number, since it uses less digits than its factorization.

18222225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 645 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 18222225 is about 4268.7498169839. The cubic root of 18222225 is about 263.1482391370.

The spelling of 18222225 in words is "eighteen million, two hundred twenty-two thousand, two hundred twenty-five".