18456228 has 48 divisors (see below), whose sum is σ = 54687360. Its totient is φ = 5272992.

The previous prime is 18456223. The next prime is 18456247. The reversal of 18456228 is 82265481.

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 = 18456192 and 18456201.

It is not an unprimeable number, because it can be changed into a prime (18456223) 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, 11451 + ... + 12962.

It is an arithmetic number, because the mean of its divisors is an integer number (1139320).

Almost surely, 2^18456228 is an apocalyptic number.

18456228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18456228 is an abundant number, since it is smaller than the sum of its proper divisors (36231132).

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

18456228 is a wasteful number, since it uses less digits than its factorization.

18456228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24433 (or 24425 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 18456228 is about 4296.0712284598. The cubic root of 18456228 is about 264.2698686663.

The spelling of 18456228 in words is "eighteen million, four hundred fifty-six thousand, two hundred twenty-eight".