18415228 has 12 divisors (see below), whose sum is σ = 34705720. Its totient is φ = 8499312.

The previous prime is 18415217. The next prime is 18415279. The reversal of 18415228 is 82251481.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18415228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177018 + ... + 177121.

Almost surely, 2^18415228 is an apocalyptic number.

It is an amenable number.

18415228 is a deficient number, since it is larger than the sum of its proper divisors (16290492).

18415228 is a wasteful number, since it uses less digits than its factorization.

18415228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354156 (or 354154 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 18415228 is about 4291.2967737037. The cubic root of 18415228 is about 264.0740341798.

The spelling of 18415228 in words is "eighteen million, four hundred fifteen thousand, two hundred twenty-eight".