18418228 has 12 divisors (see below), whose sum is σ = 32264260. Its totient is φ = 9199872.

The previous prime is 18418217. The next prime is 18418229. The reversal of 18418228 is 82281481.

It can be written as a sum of positive squares in 2 ways, for example, as 16875664 + 1542564 = 4108^2 + 1242^2 .

It is a super-2 number, since 2×18418228² = 678462245319968, which contains 22 as substring.

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 = 18418193 and 18418202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418229) 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, 4228 + ... + 7396.

Almost surely, 2^18418228 is an apocalyptic number.

It is an amenable number.

18418228 is a deficient number, since it is larger than the sum of its proper divisors (13846032).

18418228 is a wasteful number, since it uses less digits than its factorization.

18418228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4626 (or 4624 counting only the distinct ones).

The product of its digits is 8192, while the sum is 34.

The square root of 18418228 is about 4291.6463041588. The cubic root of 18418228 is about 264.0883733830.

The spelling of 18418228 in words is "eighteen million, four hundred eighteen thousand, two hundred twenty-eight".