1123580 has 12 divisors (see below), whose sum is σ = 2359560. Its totient is φ = 449424.

The previous prime is 1123567. The next prime is 1123589. The reversal of 1123580 is 853211.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 56179 = 1123580 / (1 + 1 + 2 + 3 + 5 + 8 + 0).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28070 + ... + 28109.

It is an arithmetic number, because the mean of its divisors is an integer number (196630).

2^1123580 is an apocalyptic number.

1123580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123580 is an abundant number, since it is smaller than the sum of its proper divisors (1235980).

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

1123580 is a wasteful number, since it uses less digits than its factorization.

1123580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56188 (or 56186 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1123580 is about 1059.9905659958. The cubic root of 1123580 is about 103.9604139281.

Adding to 1123580 its sum of digits (20), we get a square (1123600 = 1060²).

Adding to 1123580 its reverse (853211), we get a palindrome (1976791).

It can be divided in two parts, 112 and 3580, that multiplied together give a triangular number (400960 = T₈₉₅).

The spelling of 1123580 in words is "one million, one hundred twenty-three thousand, five hundred eighty".