18228456 has 32 divisors (see below), whose sum is σ = 50635200. Its totient is φ = 6076080.

The previous prime is 18228439. The next prime is 18228461. The reversal of 18228456 is 65482281.

18228456 is a `hidden beast` number, since 182 + 28 + 456 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18228456.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41980 + ... + 42411.

It is an arithmetic number, because the mean of its divisors is an integer number (1582350).

Almost surely, 2^18228456 is an apocalyptic number.

It is an amenable number.

18228456 is an abundant number, since it is smaller than the sum of its proper divisors (32406744).

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

18228456 is a wasteful number, since it uses less digits than its factorization.

18228456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84406 (or 84396 counting only the distinct ones).

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

The square root of 18228456 is about 4269.4795935805. The cubic root of 18228456 is about 263.1782297998.

The spelling of 18228456 in words is "eighteen million, two hundred twenty-eight thousand, four hundred fifty-six".