18294228 has 48 divisors (see below), whose sum is σ = 47698560. Its totient is φ = 6063552.

The previous prime is 18294209. The next prime is 18294229. The reversal of 18294228 is 82249281.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18294192 and 18294201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18294229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24801 + ... + 25527.

It is an arithmetic number, because the mean of its divisors is an integer number (993720).

Almost surely, 2^18294228 is an apocalyptic number.

18294228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18294228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23849280).

18294228 is an abundant number, since it is smaller than the sum of its proper divisors (29404332).

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

18294228 is a wasteful number, since it uses less digits than its factorization.

18294228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 965 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18294228 is about 4277.1752360641. The cubic root of 18294228 is about 263.4943834940.

The spelling of 18294228 in words is "eighteen million, two hundred ninety-four thousand, two hundred twenty-eight".