18228384 has 72 divisors (see below), whose sum is σ = 52284960. Its totient is φ = 6023808.

The previous prime is 18228367. The next prime is 18228389. The reversal of 18228384 is 48382281.

18228384 = T₁₄₉ + T₁₅₀ + ... + T₄₈₂.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18228389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47907 + ... + 48285.

It is an arithmetic number, because the mean of its divisors is an integer number (726180).

Almost surely, 2^18228384 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 18228384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26142480).

18228384 is an abundant number, since it is smaller than the sum of its proper divisors (34056576).

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

18228384 is a wasteful number, since it uses less digits than its factorization.

18228384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562 (or 551 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 18228384 is about 4269.4711616311. The cubic root of 18228384 is about 263.1778832929.

The spelling of 18228384 in words is "eighteen million, two hundred twenty-eight thousand, three hundred eighty-four".