12001543840 has 192 divisors, whose sum is σ = 33812069760. Its totient is φ = 3967856640.

The previous prime is 12001543777. The next prime is 12001543847. The reversal of 12001543840 is 4834510021.

It is a junction number, because it is equal to n+sod(n) for n = 12001543799 and 12001543808.

It is not an unprimeable number, because it can be changed into a prime (12001543847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1529046 + ... + 1536874.

It is an arithmetic number, because the mean of its divisors is an integer number (176104530).

Almost surely, 2^12001543840 is an apocalyptic number.

12001543840 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 12001543840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16906034880).

12001543840 is an abundant number, since it is smaller than the sum of its proper divisors (21810525920).

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

12001543840 is a wasteful number, since it uses less digits than its factorization.

12001543840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7935 (or 7927 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The spelling of 12001543840 in words is "twelve billion, one million, five hundred forty-three thousand, eight hundred forty".