1223033220 has 144 divisors (see below), whose sum is σ = 3810748032. Its totient is φ = 317399040.

The previous prime is 1223033213. The next prime is 1223033221. The reversal of 1223033220 is 223303221.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1223033193 and 1223033202.

It is not an unprimeable number, because it can be changed into a prime (1223033221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1060164 + ... + 1061316.

It is an arithmetic number, because the mean of its divisors is an integer number (26463528).

Almost surely, 2^1223033220 is an apocalyptic number.

1223033220 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 1223033220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905374016).

1223033220 is an abundant number, since it is smaller than the sum of its proper divisors (2587714812).

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

1223033220 is a wasteful number, since it uses less digits than its factorization.

1223033220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 1223033220 is about 34971.8918561750. The cubic root of 1223033220 is about 1069.4145398228.

Adding to 1223033220 its reverse (223303221), we get a palindrome (1446336441).

The spelling of 1223033220 in words is "one billion, two hundred twenty-three million, thirty-three thousand, two hundred twenty".