18941228 has 12 divisors (see below), whose sum is σ = 33287520. Its totient is φ = 9430512.

The previous prime is 18941227. The next prime is 18941231. The reversal of 18941228 is 82214981.

It is not an unprimeable number, because it can be changed into a prime (18941227) 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, 8951 + ... + 10862.

It is an arithmetic number, because the mean of its divisors is an integer number (2773960).

Almost surely, 2^18941228 is an apocalyptic number.

It is an amenable number.

18941228 is a deficient number, since it is larger than the sum of its proper divisors (14346292).

18941228 is a wasteful number, since it uses less digits than its factorization.

18941228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20056 (or 20054 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 18941228 is about 4352.1521113123. The cubic root of 18941228 is about 266.5647450777.

The spelling of 18941228 in words is "eighteen million, nine hundred forty-one thousand, two hundred twenty-eight".