1123120403 has 16 divisors (see below), whose sum is σ = 1164818016. Its totient is φ = 1082315520.

The previous prime is 1123120391. The next prime is 1123120423. The reversal of 1123120403 is 3040213211.

It is not a de Polignac number, because 1123120403 - 2¹⁴ = 1123104019 is a prime.

It is a super-2 number, since 2×1123120403² = 2522798879269764818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123120423) 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, 1280201 + ... + 1281077.

It is an arithmetic number, because the mean of its divisors is an integer number (72801126).

Almost surely, 2^1123120403 is an apocalyptic number.

1123120403 is a deficient number, since it is larger than the sum of its proper divisors (41697613).

1123120403 is an equidigital number, since it uses as much as digits as its factorization.

1123120403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1123120403 is about 33512.9885715971. The cubic root of 1123120403 is about 1039.4623709736.

Adding to 1123120403 its reverse (3040213211), we get a palindrome (4163333614).

The spelling of 1123120403 in words is "one billion, one hundred twenty-three million, one hundred twenty thousand, four hundred three".