1123450128 has 80 divisors (see below), whose sum is σ = 3250268160. Its totient is φ = 371516544.

The previous prime is 1123450127. The next prime is 1123450187. The reversal of 1123450128 is 8210543211.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1123450127) 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, 44626 + ... + 65102.

It is an arithmetic number, because the mean of its divisors is an integer number (40628352).

Almost surely, 2^1123450128 is an apocalyptic number.

1123450128 is a gapful number since it is divisible by the number (18) 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 1123450128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1625134080).

1123450128 is an abundant number, since it is smaller than the sum of its proper divisors (2126818032).

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

1123450128 is a wasteful number, since it uses less digits than its factorization.

1123450128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20621 (or 20609 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1123450128 is about 33517.9075719234. The cubic root of 1123450128 is about 1039.5640825962.

Adding to 1123450128 its reverse (8210543211), we get a palindrome (9333993339).

The spelling of 1123450128 in words is "one billion, one hundred twenty-three million, four hundred fifty thousand, one hundred twenty-eight".