123440443 has 16 divisors (see below), whose sum is σ = 147329280. Its totient is φ = 101185056.

The previous prime is 123440437. The next prime is 123440459. The reversal of 123440443 is 344044321.

It is a de Polignac number, because none of the positive numbers 2^k-123440443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123440413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18880 + ... + 24562.

It is an arithmetic number, because the mean of its divisors is an integer number (9208080).

Almost surely, 2^123440443 is an apocalyptic number.

123440443 is a deficient number, since it is larger than the sum of its proper divisors (23888837).

123440443 is a wasteful number, since it uses less digits than its factorization.

123440443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5826.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 123440443 is about 11110.3754662028. The cubic root of 123440443 is about 497.9118823355.

Adding to 123440443 its reverse (344044321), we get a palindrome (467484764).

The spelling of 123440443 in words is "one hundred twenty-three million, four hundred forty thousand, four hundred forty-three".