12400055320 has 32 divisors (see below), whose sum is σ = 29113175520. Its totient is φ = 4744368640.

The previous prime is 12400055303. The next prime is 12400055321. The reversal of 12400055320 is 2355000421.

It is a super-2 number, since 2×12400055320² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12400055291 and 12400055300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400055321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6738241 + ... + 6740080.

It is an arithmetic number, because the mean of its divisors is an integer number (909786735).

Almost surely, 2^12400055320 is an apocalyptic number.

12400055320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12400055320 is an abundant number, since it is smaller than the sum of its proper divisors (16713120200).

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

12400055320 is a wasteful number, since it uses less digits than its factorization.

12400055320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13478355 (or 13478351 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

Adding to 12400055320 its reverse (2355000421), we get a palindrome (14755055741).

The spelling of 12400055320 in words is "twelve billion, four hundred million, fifty-five thousand, three hundred twenty".