18210228 has 12 divisors (see below), whose sum is σ = 42490560. Its totient is φ = 6070072.

The previous prime is 18210209. The next prime is 18210239. The reversal of 18210228 is 82201281.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×18210228² = 663224807623968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18210198 and 18210207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 758748 + ... + 758771.

It is an arithmetic number, because the mean of its divisors is an integer number (3540880).

Almost surely, 2^18210228 is an apocalyptic number.

It is an amenable number.

18210228 is an abundant number, since it is smaller than the sum of its proper divisors (24280332).

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

18210228 is a wasteful number, since it uses less digits than its factorization.

18210228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517526 (or 1517524 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 18210228 is about 4267.3443732607. The cubic root of 18210228 is about 263.0904766610.

The spelling of 18210228 in words is "eighteen million, two hundred ten thousand, two hundred twenty-eight".