1223320 has 64 divisors (see below), whose sum is σ = 3343680. Its totient is φ = 393216.

The previous prime is 1223311. The next prime is 1223323. The reversal of 1223320 is 233221.

It is a happy number.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1223320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4632 + ... + 4888.

It is an arithmetic number, because the mean of its divisors is an integer number (52245).

2^1223320 is an apocalyptic number.

1223320 is a gapful number since it is divisible by the number (10) 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 1223320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1671840).

1223320 is an abundant number, since it is smaller than the sum of its proper divisors (2120360).

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

1223320 is a wasteful number, since it uses less digits than its factorization.

1223320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 1223320 is about 1106.0379740316. The cubic root of 1223320 is about 106.9498119655.

Adding to 1223320 its reverse (233221), we get a palindrome (1456541).

Subtracting from 1223320 its reverse (233221), we obtain a palindrome (990099).

It can be divided in two parts, 12 and 23320, that added together give a palindrome (23332).

The spelling of 1223320 in words is "one million, two hundred twenty-three thousand, three hundred twenty".