1123001220 has 192 divisors, whose sum is σ = 3704279040. Its totient is φ = 251328000.

The previous prime is 1123001219. The next prime is 1123001233. The reversal of 1123001220 is 221003211.

It is a super-2 number, since 2×1123001220² = 2522263480242976800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1123001196 and 1123001205.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 438945 + ... + 441495.

It is an arithmetic number, because the mean of its divisors is an integer number (19293120).

Almost surely, 2^1123001220 is an apocalyptic number.

1123001220 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 1123001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1852139520).

1123001220 is an abundant number, since it is smaller than the sum of its proper divisors (2581277820).

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

1123001220 is a wasteful number, since it uses less digits than its factorization.

1123001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626 (or 2624 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1123001220 is about 33511.2103631009. The cubic root of 1123001220 is about 1039.4256012067.

Adding to 1123001220 its reverse (221003211), we get a palindrome (1344004431).

The spelling of 1123001220 in words is "one billion, one hundred twenty-three million, one thousand, two hundred twenty".