12805019840 has 28 divisors (see below), whose sum is σ = 30491954256. Its totient is φ = 5122007808.

The previous prime is 12805019831. The next prime is 12805019849. The reversal of 12805019840 is 4891050821.

12805019840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12805019831) and next prime (12805019849).

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12805019794 and 12805019803.

It is not an unprimeable number, because it can be changed into a prime (12805019849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20007524 + ... + 20008163.

Almost surely, 2^12805019840 is an apocalyptic number.

12805019840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12805019840 is an abundant number, since it is smaller than the sum of its proper divisors (17686934416).

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

12805019840 is an equidigital number, since it uses as much as digits as its factorization.

12805019840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40015704 (or 40015694 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 12805019840 in words is "twelve billion, eight hundred five million, nineteen thousand, eight hundred forty".