1123323220 has 48 divisors (see below), whose sum is σ = 2470527360. Its totient is φ = 428224896.

The previous prime is 1123323217. The next prime is 1123323221. The reversal of 1123323220 is 223233211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123323221) 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, 125866 + ... + 134494.

It is an arithmetic number, because the mean of its divisors is an integer number (51469320).

Almost surely, 2^1123323220 is an apocalyptic number.

1123323220 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 1123323220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235263680).

1123323220 is an abundant number, since it is smaller than the sum of its proper divisors (1347204140).

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

1123323220 is a wasteful number, since it uses less digits than its factorization.

1123323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8944 (or 8942 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1123323220 is about 33516.0143811880. The cubic root of 1123323220 is about 1039.5249371212.

Adding to 1123323220 its reverse (223233211), we get a palindrome (1346556431).

Subtracting from 1123323220 its reverse (223233211), we obtain a palindrome (900090009).

It can be divided in two parts, 11233 and 23220, that added together give a triangular number (34453 = T₂₆₂).

The spelling of 1123323220 in words is "one billion, one hundred twenty-three million, three hundred twenty-three thousand, two hundred twenty".