18208228 has 6 divisors (see below), whose sum is σ = 31864406. Its totient is φ = 9104112.

The previous prime is 18208189. The next prime is 18208231. The reversal of 18208228 is 82280281.

It can be written as a sum of positive squares in only one way, i.e., 17489124 + 719104 = 4182^2 + 848^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18208228.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2276025 + ... + 2276032.

Almost surely, 2^18208228 is an apocalyptic number.

It is an amenable number.

18208228 is a deficient number, since it is larger than the sum of its proper divisors (13656178).

18208228 is a wasteful number, since it uses less digits than its factorization.

18208228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4552061 (or 4552059 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 18208228 is about 4267.1100290478. The cubic root of 18208228 is about 263.0808447073.

The spelling of 18208228 in words is "eighteen million, two hundred eight thousand, two hundred twenty-eight".