18224636 has 6 divisors (see below), whose sum is σ = 31893120. Its totient is φ = 9112316.

The previous prime is 18224617. The next prime is 18224639. The reversal of 18224636 is 63642281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18224639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2278076 + ... + 2278083.

It is an arithmetic number, because the mean of its divisors is an integer number (5315520).

Almost surely, 2^18224636 is an apocalyptic number.

It is an amenable number.

18224636 is a deficient number, since it is larger than the sum of its proper divisors (13668484).

18224636 is a wasteful number, since it uses less digits than its factorization.

18224636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4556163 (or 4556161 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 18224636 is about 4269.0322088267. The cubic root of 18224636 is about 263.1598444234.

The spelling of 18224636 in words is "eighteen million, two hundred twenty-four thousand, six hundred thirty-six".