18222489 has 10 divisors (see below), whose sum is σ = 27221370. Its totient is φ = 12148272.

The previous prime is 18222473. The next prime is 18222541. The reversal of 18222489 is 98422281.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 4473225 = 3708^2 + 2115^2 .

It is not a de Polignac number, because 18222489 - 2⁴ = 18222473 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18222289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 112404 + ... + 112565.

It is an arithmetic number, because the mean of its divisors is an integer number (2722137).

Almost surely, 2^18222489 is an apocalyptic number.

It is an amenable number.

18222489 is a deficient number, since it is larger than the sum of its proper divisors (8998881).

18222489 is an equidigital number, since it uses as much as digits as its factorization.

18222489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224981 (or 224972 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18222489 is about 4268.7807392744. The cubic root of 18222489 is about 263.1495099441.

The spelling of 18222489 in words is "eighteen million, two hundred twenty-two thousand, four hundred eighty-nine".