1123443440 has 80 divisors (see below), whose sum is σ = 3018824640. Its totient is φ = 380835840.

The previous prime is 1123443439. The next prime is 1123443443. The reversal of 1123443440 is 443443211.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123443443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38570 + ... + 61110.

It is an arithmetic number, because the mean of its divisors is an integer number (37735308).

Almost surely, 2^1123443440 is an apocalyptic number.

1123443440 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 1123443440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509412320).

1123443440 is an abundant number, since it is smaller than the sum of its proper divisors (1895381200).

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

1123443440 is a wasteful number, since it uses less digits than its factorization.

1123443440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22650 (or 22644 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 1123443440 is about 33517.8078042106. The cubic root of 1123443440 is about 1039.5620197191.

Adding to 1123443440 its reverse (443443211), we get a palindrome (1566886651).

The spelling of 1123443440 in words is "one billion, one hundred twenty-three million, four hundred forty-three thousand, four hundred forty".