1220328 has 48 divisors (see below), whose sum is σ = 3502980. Its totient is φ = 382464.

The previous prime is 1220327. The next prime is 1220333. The reversal of 1220328 is 8230221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1077444 + 142884 = 1038^2 + 378^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1220328.

It is not an unprimeable number, because it can be changed into a prime (1220327) 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 11 ways as a sum of consecutive naturals, for example, 726 + ... + 1722.

2^1220328 is an apocalyptic number.

1220328 is a gapful number since it is divisible by the number (18) 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 1220328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1751490).

1220328 is an abundant number, since it is smaller than the sum of its proper divisors (2282652).

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

1220328 is a wasteful number, since it uses less digits than its factorization.

1220328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1220328 is about 1104.6845703639. The cubic root of 1220328 is about 106.8625480517.

Adding to 1220328 its reverse (8230221), we get a palindrome (9450549).

The spelling of 1220328 in words is "one million, two hundred twenty thousand, three hundred twenty-eight".