18224416 has 24 divisors (see below), whose sum is σ = 41005440. Its totient is φ = 7810368.

The previous prime is 18224359. The next prime is 18224417. The reversal of 18224416 is 61442281.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18224417) 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, 40456 + ... + 40903.

It is an arithmetic number, because the mean of its divisors is an integer number (1708560).

Almost surely, 2^18224416 is an apocalyptic number.

18224416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18224416 is an abundant number, since it is smaller than the sum of its proper divisors (22781024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18224416 is an equidigital number, since it uses as much as digits as its factorization.

18224416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81376 (or 81368 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 18224416 is about 4269.0064417848. The cubic root of 18224416 is about 263.1587855015.

Adding to 18224416 its reverse (61442281), we get a palindrome (79666697).

The spelling of 18224416 in words is "eighteen million, two hundred twenty-four thousand, four hundred sixteen".