18228249 has 12 divisors (see below), whose sum is σ = 28355236. Its totient is φ = 11217312.

The previous prime is 18228241. The next prime is 18228263. The reversal of 18228249 is 94282281.

It can be written as a sum of positive squares in 2 ways, for example, as 10208025 + 8020224 = 3195^2 + 2832^2 .

It is not a de Polignac number, because 18228249 - 2³ = 18228241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18228241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77782 + ... + 78015.

Almost surely, 2^18228249 is an apocalyptic number.

It is an amenable number.

18228249 is a deficient number, since it is larger than the sum of its proper divisors (10126987).

18228249 is a wasteful number, since it uses less digits than its factorization.

18228249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155816 (or 155813 counting only the distinct ones).

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

The square root of 18228249 is about 4269.4553516813. The cubic root of 18228249 is about 263.1772335900.

The spelling of 18228249 in words is "eighteen million, two hundred twenty-eight thousand, two hundred forty-nine".