18236228 has 12 divisors (see below), whose sum is σ = 31990140. Its totient is φ = 9096192.

The previous prime is 18236221. The next prime is 18236243. The reversal of 18236228 is 82263281.

It can be written as a sum of positive squares in 2 ways, for example, as 8111104 + 10125124 = 2848^2 + 3182^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18236194 and 18236203.

It is not an unprimeable number, because it can be changed into a prime (18236221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3533 + ... + 6996.

It is an arithmetic number, because the mean of its divisors is an integer number (2665845).

Almost surely, 2^18236228 is an apocalyptic number.

It is an amenable number.

18236228 is a deficient number, since it is larger than the sum of its proper divisors (13753912).

18236228 is a wasteful number, since it uses less digits than its factorization.

18236228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10966 (or 10964 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 18236228 is about 4270.3896777695. The cubic root of 18236228 is about 263.2156279311.

The spelling of 18236228 in words is "eighteen million, two hundred thirty-six thousand, two hundred twenty-eight".