12840404520 has 128 divisors (see below), whose sum is σ = 39609072000. Its totient is φ = 3327630336.

The previous prime is 12840404513. The next prime is 12840404561. The reversal of 12840404520 is 2540404821.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 6876627 + ... + 6878493.

It is an arithmetic number, because the mean of its divisors is an integer number (309445875).

Almost surely, 2^12840404520 is an apocalyptic number.

12840404520 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 12840404520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19804536000).

12840404520 is an abundant number, since it is smaller than the sum of its proper divisors (26768667480).

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

12840404520 is a wasteful number, since it uses less digits than its factorization.

12840404520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467 (or 3463 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 30.

The spelling of 12840404520 in words is "twelve billion, eight hundred forty million, four hundred four thousand, five hundred twenty".