18224427 has 8 divisors (see below), whose sum is σ = 26168464. Its totient is φ = 11215008.

The previous prime is 18224419. The next prime is 18224443. The reversal of 18224427 is 72442281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18224427 - 2³ = 18224419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18224394 and 18224403.

It is not an unprimeable number, because it can be changed into a prime (18224417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233608 + ... + 233685.

It is an arithmetic number, because the mean of its divisors is an integer number (3271058).

Almost surely, 2^18224427 is an apocalyptic number.

18224427 is a deficient number, since it is larger than the sum of its proper divisors (7944037).

18224427 is a wasteful number, since it uses less digits than its factorization.

18224427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467309.

The product of its digits is 7168, while the sum is 30.

The square root of 18224427 is about 4269.0077301406. The cubic root of 18224427 is about 263.1588384478.

The spelling of 18224427 in words is "eighteen million, two hundred twenty-four thousand, four hundred twenty-seven".