1123143220 has 12 divisors (see below), whose sum is σ = 2358600804. Its totient is φ = 449257280.

The previous prime is 1123143173. The next prime is 1123143253. The reversal of 1123143220 is 223413211.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 311804964 + 811338256 = 17658^2 + 28484^2 .

It is a super-2 number, since 2×1123143220² = 2522901385263936800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28078561 + ... + 28078600.

It is an arithmetic number, because the mean of its divisors is an integer number (196550067).

Almost surely, 2^1123143220 is an apocalyptic number.

1123143220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123143220 is an abundant number, since it is smaller than the sum of its proper divisors (1235457584).

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

1123143220 is a wasteful number, since it uses less digits than its factorization.

1123143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56157170 (or 56157168 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1123143220 is about 33513.3289901197. The cubic root of 1123143220 is about 1039.4694100682.

Adding to 1123143220 its reverse (223413211), we get a palindrome (1346556431).

The spelling of 1123143220 in words is "one billion, one hundred twenty-three million, one hundred forty-three thousand, two hundred twenty".