1218224 has 40 divisors (see below), whose sum is σ = 2752800. Its totient is φ = 511488.

The previous prime is 1218221. The next prime is 1218247. The reversal of 1218224 is 4228121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1218196 and 1218205.

It is not an unprimeable number, because it can be changed into a prime (1218221) 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, 8102 + ... + 8250.

It is an arithmetic number, because the mean of its divisors is an integer number (68820).

2^1218224 is an apocalyptic number.

1218224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1376400).

1218224 is an abundant number, since it is smaller than the sum of its proper divisors (1534576).

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

1218224 is a wasteful number, since it uses less digits than its factorization.

1218224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237 (or 231 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

The square root of 1218224 is about 1103.7318514929. The cubic root of 1218224 is about 106.8010978673.

The spelling of 1218224 in words is "one million, two hundred eighteen thousand, two hundred twenty-four".