123420343424 has 128 divisors (see below), whose sum is σ = 294276430080. Its totient is φ = 50412257280.

The previous prime is 123420343411. The next prime is 123420343427. The reversal of 123420343424 is 424343024321.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (123420343427) 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, 5780192 + ... + 5801504.

It is an arithmetic number, because the mean of its divisors is an integer number (2299034610).

Almost surely, 2^123420343424 is an apocalyptic number.

123420343424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123420343424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147138215040).

123420343424 is an abundant number, since it is smaller than the sum of its proper divisors (170856086656).

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

123420343424 is a wasteful number, since it uses less digits than its factorization.

123420343424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21638 (or 21626 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 123420343424 its reverse (424343024321), we get a palindrome (547763367745).

The spelling of 123420343424 in words is "one hundred twenty-three billion, four hundred twenty million, three hundred forty-three thousand, four hundred twenty-four".