1042440123 has 4 divisors (see below), whose sum is σ = 1389920168. Its totient is φ = 694960080.

The previous prime is 1042440107. The next prime is 1042440151. The reversal of 1042440123 is 3210442401.

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

It is not a de Polignac number, because 1042440123 - 2⁴ = 1042440107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1042440123.

It is not an unprimeable number, because it can be changed into a prime (1042440173) 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 3 ways as a sum of consecutive naturals, for example, 173740018 + ... + 173740023.

It is an arithmetic number, because the mean of its divisors is an integer number (347480042).

Almost surely, 2^1042440123 is an apocalyptic number.

1042440123 is a deficient number, since it is larger than the sum of its proper divisors (347480045).

1042440123 is an equidigital number, since it uses as much as digits as its factorization.

1042440123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347480044.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1042440123 is about 32286.8413289377. The cubic root of 1042440123 is about 1013.9511674642.

Adding to 1042440123 its reverse (3210442401), we get a palindrome (4252882524).

The spelling of 1042440123 in words is "one billion, forty-two million, four hundred forty thousand, one hundred twenty-three".