18427228 has 6 divisors (see below), whose sum is σ = 32247656. Its totient is φ = 9213612.

The previous prime is 18427223. The next prime is 18427259. The reversal of 18427228 is 82272481.

It is a junction number, because it is equal to n+sod(n) for n = 18427193 and 18427202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18427223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2303400 + ... + 2303407.

Almost surely, 2^18427228 is an apocalyptic number.

It is an amenable number.

18427228 is a deficient number, since it is larger than the sum of its proper divisors (13820428).

18427228 is a wasteful number, since it uses less digits than its factorization.

18427228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4606811 (or 4606809 counting only the distinct ones).

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

The square root of 18427228 is about 4292.6947247621. The cubic root of 18427228 is about 264.1313816523.

The spelling of 18427228 in words is "eighteen million, four hundred twenty-seven thousand, two hundred twenty-eight".