18222275 has 6 divisors (see below), whose sum is σ = 22595652. Its totient is φ = 14577800.

The previous prime is 18222271. The next prime is 18222277. The reversal of 18222275 is 57222281.

It is not a de Polignac number, because 18222275 - 2² = 18222271 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18222271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 364421 + ... + 364470.

It is an arithmetic number, because the mean of its divisors is an integer number (3765942).

Almost surely, 2^18222275 is an apocalyptic number.

18222275 is a deficient number, since it is larger than the sum of its proper divisors (4373377).

18222275 is an equidigital number, since it uses as much as digits as its factorization.

18222275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728901 (or 728896 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 18222275 is about 4268.7556734955. The cubic root of 18222275 is about 263.1484798211.

The spelling of 18222275 in words is "eighteen million, two hundred twenty-two thousand, two hundred seventy-five".