18512228 has 24 divisors (see below), whose sum is σ = 37497600. Its totient is φ = 7832448.

The previous prime is 18512227. The next prime is 18512243. The reversal of 18512228 is 82221581.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18512228.

It is not an unprimeable number, because it can be changed into a prime (18512227) 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, 1973 + ... + 6396.

It is an arithmetic number, because the mean of its divisors is an integer number (1562400).

Almost surely, 2^18512228 is an apocalyptic number.

It is an amenable number.

18512228 is an abundant number, since it is smaller than the sum of its proper divisors (18985372).

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

18512228 is a wasteful number, since it uses less digits than its factorization.

18512228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8459 (or 8457 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 18512228 is about 4302.5838748361. The cubic root of 18512228 is about 264.5368818749.

The spelling of 18512228 in words is "eighteen million, five hundred twelve thousand, two hundred twenty-eight".