1123280 has 40 divisors (see below), whose sum is σ = 2752800. Its totient is φ = 425088.

The previous prime is 1123279. The next prime is 1123303. The reversal of 1123280 is 823211.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1151 + ... + 1889.

It is an arithmetic number, because the mean of its divisors is an integer number (68820).

2^1123280 is an apocalyptic number.

1123280 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 1123280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1376400).

1123280 is an abundant number, since it is smaller than the sum of its proper divisors (1629520).

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

1123280 is a wasteful number, since it uses less digits than its factorization.

1123280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1123280 is about 1059.8490458551. The cubic root of 1123280 is about 103.9511605000.

Adding to 1123280 its reverse (823211), we get a palindrome (1946491).

The spelling of 1123280 in words is "one million, one hundred twenty-three thousand, two hundred eighty".