1123503540 has 96 divisors (see below), whose sum is σ = 3344737536. Its totient is φ = 281149440.

The previous prime is 1123503533. The next prime is 1123503569. The reversal of 1123503540 is 453053211.

It is a self number, because there is not a number n which added to its sum of digits gives 1123503540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65460 + ... + 80820.

It is an arithmetic number, because the mean of its divisors is an integer number (34841016).

Almost surely, 2^1123503540 is an apocalyptic number.

1123503540 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 1123503540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1672368768).

1123503540 is an abundant number, since it is smaller than the sum of its proper divisors (2221233996).

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

1123503540 is a wasteful number, since it uses less digits than its factorization.

1123503540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15449 (or 15447 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1123503540 is about 33518.7043305674. The cubic root of 1123503540 is about 1039.5805569417.

Adding to 1123503540 its reverse (453053211), we get a palindrome (1576556751).

The spelling of 1123503540 in words is "one billion, one hundred twenty-three million, five hundred three thousand, five hundred forty".