1123728372 has 72 divisors (see below), whose sum is σ = 3063307520. Its totient is φ = 345280320.

The previous prime is 1123728341. The next prime is 1123728383. The reversal of 1123728372 is 2738273211.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 485097 + ... + 487407.

Almost surely, 2^1123728372 is an apocalyptic number.

1123728372 is a gapful number since it is divisible by the number (12) 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 1123728372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1531653760).

1123728372 is an abundant number, since it is smaller than the sum of its proper divisors (1939579148).

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

1123728372 is a wasteful number, since it uses less digits than its factorization.

1123728372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373 (or 3368 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 1123728372 is about 33522.0579917164. The cubic root of 1123728372 is about 1039.6498981819.

The spelling of 1123728372 in words is "one billion, one hundred twenty-three million, seven hundred twenty-eight thousand, three hundred seventy-two".