12405989727 has 80 divisors (see below), whose sum is σ = 19810391040. Its totient is φ = 7723900800.

The previous prime is 12405989723. The next prime is 12405989731. The reversal of 12405989727 is 72798950421.

12405989727 is a `hidden beast` number, since 1 + 2 + 40 + 598 + 9 + 7 + 2 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (12405989723) and next prime (12405989731).

It is not a de Polignac number, because 12405989727 - 2² = 12405989723 is a prime.

It is a super-2 number, since 2×12405989727² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12405989723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 9608952 + ... + 9610242.

It is an arithmetic number, because the mean of its divisors is an integer number (247629888).

Almost surely, 2^12405989727 is an apocalyptic number.

12405989727 is a deficient number, since it is larger than the sum of its proper divisors (7404401313).

12405989727 is a wasteful number, since it uses less digits than its factorization.

12405989727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466 (or 1457 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 12405989727 in words is "twelve billion, four hundred five million, nine hundred eighty-nine thousand, seven hundred twenty-seven".