12405543540 has 96 divisors (see below), whose sum is σ = 37858375296. Its totient is φ = 3016865280.

The previous prime is 12405543539. The next prime is 12405543551. The reversal of 12405543540 is 4534550421.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31071 + ... + 160550.

It is an arithmetic number, because the mean of its divisors is an integer number (394358076).

Almost surely, 2^12405543540 is an apocalyptic number.

12405543540 is a gapful number since it is divisible by the number (10) 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 12405543540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18929187648).

12405543540 is an abundant number, since it is smaller than the sum of its proper divisors (25452831756).

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

12405543540 is a wasteful number, since it uses less digits than its factorization.

12405543540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191729 (or 191727 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 12405543540 in words is "twelve billion, four hundred five million, five hundred forty-three thousand, five hundred forty".