18274228 has 12 divisors (see below), whose sum is σ = 36548512. Its totient is φ = 7831800.

The previous prime is 18274199. The next prime is 18274229. The reversal of 18274228 is 82247281.

18274228 is an admirable number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18274193 and 18274202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18274229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326298 + ... + 326353.

Almost surely, 2^18274228 is an apocalyptic number.

It is an amenable number.

18274228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18274228 is a wasteful number, since it uses less digits than its factorization.

18274228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652662 (or 652660 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 18274228 is about 4274.8366050646. The cubic root of 18274228 is about 263.3983275275.

The spelling of 18274228 in words is "eighteen million, two hundred seventy-four thousand, two hundred twenty-eight".