18885228 has 24 divisors (see below), whose sum is σ = 44162160. Its totient is φ = 6281280.

The previous prime is 18885227. The next prime is 18885233. The reversal of 18885228 is 82258881.

It is a super-2 number, since 2×18885228² = 713303673223968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18885228.

It is not an unprimeable number, because it can be changed into a prime (18885227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5038 + ... + 7946.

It is an arithmetic number, because the mean of its divisors is an integer number (1840090).

Almost surely, 2^18885228 is an apocalyptic number.

It is an amenable number.

18885228 is an abundant number, since it is smaller than the sum of its proper divisors (25276932).

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

18885228 is a wasteful number, since it uses less digits than its factorization.

18885228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457 (or 3455 counting only the distinct ones).

The product of its digits is 81920, while the sum is 42.

The square root of 18885228 is about 4345.7137503522. The cubic root of 18885228 is about 266.3017849856.

The spelling of 18885228 in words is "eighteen million, eight hundred eighty-five thousand, two hundred twenty-eight".