18232228 has 24 divisors (see below), whose sum is σ = 38610432. Its totient is φ = 7353984.

The previous prime is 18232223. The next prime is 18232237. The reversal of 18232228 is 82223281.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 18232196 and 18232205.

It is not an unprimeable number, because it can be changed into a prime (18232223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18676 + ... + 19627.

It is an arithmetic number, because the mean of its divisors is an integer number (1608768).

Almost surely, 2^18232228 is an apocalyptic number.

It is an amenable number.

18232228 is an abundant number, since it is smaller than the sum of its proper divisors (20378204).

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

18232228 is a wasteful number, since it uses less digits than its factorization.

18232228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38331 (or 38329 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 18232228 is about 4269.9213107504. The cubic root of 18232228 is about 263.1963816356.

The spelling of 18232228 in words is "eighteen million, two hundred thirty-two thousand, two hundred twenty-eight".