18276228 has 18 divisors (see below), whose sum is σ = 46198334. Its totient is φ = 6092064.

The previous prime is 18276227. The next prime is 18276257. The reversal of 18276228 is 82267281.

It is a happy number.

18276228 is a `hidden beast` number, since 1 + 8 + 27 + 622 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18249984 + 26244 = 4272^2 + 162^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 507673 = 18276228 / (1 + 8 + 2 + 7 + 6 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 18276192 and 18276201.

It is not an unprimeable number, because it can be changed into a prime (18276221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 253801 + ... + 253872.

Almost surely, 2^18276228 is an apocalyptic number.

18276228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18276228 is an abundant number, since it is smaller than the sum of its proper divisors (27922106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18276228 is a wasteful number, since it uses less digits than its factorization.

18276228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507683 (or 507678 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 18276228 is about 4275.0705257340. The cubic root of 18276228 is about 263.4079362770.

The spelling of 18276228 in words is "eighteen million, two hundred seventy-six thousand, two hundred twenty-eight".