1123123320 has 160 divisors (see below), whose sum is σ = 4118249520. Its totient is φ = 272263680.

The previous prime is 1123123289. The next prime is 1123123387. The reversal of 1123123320 is 233213211.

It is a super-2 number, since 2×1123123320² = 2522811983855644800, which contains 22 as substring.

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 = 1123123293 and 1123123302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19884 + ... + 51396.

Almost surely, 2^1123123320 is an apocalyptic number.

1123123320 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 1123123320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2059124760).

1123123320 is an abundant number, since it is smaller than the sum of its proper divisors (2995126200).

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

1123123320 is a wasteful number, since it uses less digits than its factorization.

1123123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31547 (or 31534 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1123123320 is about 33513.0320920086. The cubic root of 1123123320 is about 1039.4632708798.

Adding to 1123123320 its reverse (233213211), we get a palindrome (1356336531).

The spelling of 1123123320 in words is "one billion, one hundred twenty-three million, one hundred twenty-three thousand, three hundred twenty".