18801228 has 12 divisors (see below), whose sum is σ = 43869560. Its totient is φ = 6267072.

The previous prime is 18801187. The next prime is 18801253. The reversal of 18801228 is 82210881.

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

It is a junction number, because it is equal to n+sod(n) for n = 18801195 and 18801204.

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, 783373 + ... + 783396.

Almost surely, 2^18801228 is an apocalyptic number.

It is an amenable number.

18801228 is an abundant number, since it is smaller than the sum of its proper divisors (25068332).

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

18801228 is a wasteful number, since it uses less digits than its factorization.

18801228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566776 (or 1566774 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 18801228 is about 4336.0382839638. The cubic root of 18801228 is about 265.9063683874.

The spelling of 18801228 in words is "eighteen million, eight hundred one thousand, two hundred twenty-eight".