123440505444 has 96 divisors (see below), whose sum is σ = 324663171840. Its totient is φ = 40552130304.

The previous prime is 123440505443. The next prime is 123440505457. The reversal of 123440505444 is 444505044321.

123440505444 is a `hidden beast` number, since 1 + 23 + 4 + 40 + 50 + 544 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 123440505399 and 123440505408.

It is not an unprimeable number, because it can be changed into a prime (123440505443) 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 31 ways as a sum of consecutive naturals, for example, 11765569 + ... + 11776055.

It is an arithmetic number, because the mean of its divisors is an integer number (3381908040).

Almost surely, 2^123440505444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123440505444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162331585920).

123440505444 is an abundant number, since it is smaller than the sum of its proper divisors (201222666396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123440505444 is a wasteful number, since it uses less digits than its factorization.

123440505444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12066 (or 12058 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 36.

Adding to 123440505444 its reverse (444505044321), we get a palindrome (567945549765).

The spelling of 123440505444 in words is "one hundred twenty-three billion, four hundred forty million, five hundred five thousand, four hundred forty-four".