12040123305 has 16 divisors (see below), whose sum is σ = 22016225664. Its totient is φ = 5504056320.

The previous prime is 12040123289. The next prime is 12040123307. The reversal of 12040123305 is 50332104021.

It is not a de Polignac number, because 12040123305 - 2⁴ = 12040123289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12040123307) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 57333816 + ... + 57334025.

It is an arithmetic number, because the mean of its divisors is an integer number (1376014104).

Almost surely, 2^12040123305 is an apocalyptic number.

12040123305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12040123305 is a deficient number, since it is larger than the sum of its proper divisors (9976102359).

12040123305 is a wasteful number, since it uses less digits than its factorization.

12040123305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114667856.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 12040123305 its reverse (50332104021), we get a palindrome (62372227326).

The spelling of 12040123305 in words is "twelve billion, forty million, one hundred twenty-three thousand, three hundred five".