1123243100 has 72 divisors (see below), whose sum is σ = 2791154688. Its totient is φ = 384350400.

The previous prime is 1123243073. The next prime is 1123243117. The reversal of 1123243100 is 13423211.

It is a super-2 number, since 2×1123243100² = 2523350123395220000, 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 23 ways as a sum of consecutive naturals, for example, 440429 + ... + 442971.

Almost surely, 2^1123243100 is an apocalyptic number.

1123243100 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 1123243100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1395577344).

1123243100 is an abundant number, since it is smaller than the sum of its proper divisors (1667911588).

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

1123243100 is a wasteful number, since it uses less digits than its factorization.

1123243100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195 (or 3188 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1123243100 is about 33514.8191103577. The cubic root of 1123243100 is about 1039.5002221455.

Adding to 1123243100 its reverse (13423211), we get a palindrome (1136666311).

The spelling of 1123243100 in words is "one billion, one hundred twenty-three million, two hundred forty-three thousand, one hundred".