18873228 has 24 divisors (see below), whose sum is σ = 48041280. Its totient is φ = 5719120.

The previous prime is 18873227. The next prime is 18873299. The reversal of 18873228 is 82237881.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18873227) 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, 71358 + ... + 71621.

It is an arithmetic number, because the mean of its divisors is an integer number (2001720).

Almost surely, 2^18873228 is an apocalyptic number.

It is an amenable number.

18873228 is an abundant number, since it is smaller than the sum of its proper divisors (29168052).

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

18873228 is a wasteful number, since it uses less digits than its factorization.

18873228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142997 (or 142995 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 18873228 is about 4344.3328601754. The cubic root of 18873228 is about 266.2453687836.

It can be divided in two parts, 1887 and 3228, that added together give a palindrome (5115).

The spelling of 18873228 in words is "eighteen million, eight hundred seventy-three thousand, two hundred twenty-eight".