18250228 has 6 divisors (see below), whose sum is σ = 31937906. Its totient is φ = 9125112.

The previous prime is 18250217. The next prime is 18250237. The reversal of 18250228 is 82205281.

It can be written as a sum of positive squares in only one way, i.e., 13704804 + 4545424 = 3702^2 + 2132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18250196 and 18250205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2281275 + ... + 2281282.

Almost surely, 2^18250228 is an apocalyptic number.

It is an amenable number.

18250228 is a deficient number, since it is larger than the sum of its proper divisors (13687678).

18250228 is a wasteful number, since it uses less digits than its factorization.

18250228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562561 (or 4562559 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 18250228 is about 4272.0285579570. The cubic root of 18250228 is about 263.2829678107.

The spelling of 18250228 in words is "eighteen million, two hundred fifty thousand, two hundred twenty-eight".