1123123405 has 8 divisors (see below), whose sum is σ = 1347960312. Its totient is φ = 898357248.

The previous prime is 1123123403. The next prime is 1123123423. The reversal of 1123123405 is 5043213211.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 433430761 + 689692644 = 20819^2 + 26262^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1123123405 - 2¹ = 1123123403 is a prime.

It is a super-2 number, since 2×1123123405² = 2522812365717588050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123123403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27949 + ... + 55021.

It is an arithmetic number, because the mean of its divisors is an integer number (168495039).

Almost surely, 2^1123123405 is an apocalyptic number.

It is an amenable number.

1123123405 is a deficient number, since it is larger than the sum of its proper divisors (224836907).

1123123405 is an equidigital number, since it uses as much as digits as its factorization.

1123123405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35375.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1123123405 is about 33513.0333601720. The cubic root of 1123123405 is about 1039.4632971026.

Adding to 1123123405 its reverse (5043213211), we get a palindrome (6166336616).

The spelling of 1123123405 in words is "one billion, one hundred twenty-three million, one hundred twenty-three thousand, four hundred five".