1123023220 has 48 divisors (see below), whose sum is σ = 2581020288. Its totient is φ = 407058560.

The previous prime is 1123023203. The next prime is 1123023227. The reversal of 1123023220 is 223203211.

It is a super-2 number, since 2×1123023220² = 2522362305318336800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1123023194 and 1123023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123023227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61689 + ... + 77791.

It is an arithmetic number, because the mean of its divisors is an integer number (53771256).

Almost surely, 2^1123023220 is an apocalyptic number.

1123023220 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 1123023220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1290510144).

1123023220 is an abundant number, since it is smaller than the sum of its proper divisors (1457997068).

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

1123023220 is a wasteful number, since it uses less digits than its factorization.

1123023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16440 (or 16438 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1123023220 is about 33511.5386098579. The cubic root of 1123023220 is about 1039.4323887368.

Adding to 1123023220 its reverse (223203211), we get a palindrome (1346226431).

Subtracting from 1123023220 its reverse (223203211), we obtain a square (899820009 = 29997²).

The spelling of 1123023220 in words is "one billion, one hundred twenty-three million, twenty-three thousand, two hundred twenty".