404240123 has 4 divisors (see below), whose sum is σ = 461988720. Its totient is φ = 346491528.

The previous prime is 404240071. The next prime is 404240149. The reversal of 404240123 is 321042404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 404240123 - 2¹⁸ = 403977979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404240095 and 404240104.

It is not an unprimeable number, because it can be changed into a prime (404240173) 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, 28874288 + ... + 28874301.

It is an arithmetic number, because the mean of its divisors is an integer number (115497180).

Almost surely, 2^404240123 is an apocalyptic number.

404240123 is a deficient number, since it is larger than the sum of its proper divisors (57748597).

404240123 is an equidigital number, since it uses as much as digits as its factorization.

404240123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57748596.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 404240123 is about 20105.7236378102. The cubic root of 404240123 is about 739.4006121532.

Adding to 404240123 its reverse (321042404), we get a palindrome (725282527).

The spelling of 404240123 in words is "four hundred four million, two hundred forty thousand, one hundred twenty-three".