18446224 has 40 divisors (see below), whose sum is σ = 38401560. Its totient is φ = 8552448.

The previous prime is 18446213. The next prime is 18446227. The reversal of 18446224 is 42264481.

It can be written as a sum of positive squares in 4 ways, for example, as 1140624 + 17305600 = 1068^2 + 4160^2 .

It is not an unprimeable number, because it can be changed into a prime (18446227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19392 + ... + 20320.

It is an arithmetic number, because the mean of its divisors is an integer number (960039).

Almost surely, 2^18446224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18446224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19200780).

18446224 is an abundant number, since it is smaller than the sum of its proper divisors (19955336).

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

18446224 is a wasteful number, since it uses less digits than its factorization.

18446224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1021 counting only the distinct ones).

The product of its digits is 12288, while the sum is 31.

The square root of 18446224 is about 4294.9067510250. The cubic root of 18446224 is about 264.2221118227. Note that the first 3 decimals are identical.

The spelling of 18446224 in words is "eighteen million, four hundred forty-six thousand, two hundred twenty-four".