18224356 has 6 divisors (see below), whose sum is σ = 31892630. Its totient is φ = 9112176.

The previous prime is 18224321. The next prime is 18224359. The reversal of 18224356 is 65342281.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 25600 = 4266^2 + 160^2 .

It is a super-2 number, since 2×18224356² = 664254303229472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18224359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2278041 + ... + 2278048.

Almost surely, 2^18224356 is an apocalyptic number.

It is an amenable number.

18224356 is a deficient number, since it is larger than the sum of its proper divisors (13668274).

18224356 is a wasteful number, since it uses less digits than its factorization.

18224356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556093 (or 4556091 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 18224356 is about 4268.9994143827. Note that the first 3 decimals coincide. The cubic root of 18224356 is about 263.1584967032.

The spelling of 18224356 in words is "eighteen million, two hundred twenty-four thousand, three hundred fifty-six".