12687843 has 16 divisors (see below), whose sum is σ = 19388160. Its totient is φ = 7229856.

The previous prime is 12687841. The next prime is 12687847. The reversal of 12687843 is 34878621.

12687843 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 3562²-1.

It is not a de Polignac number, because 12687843 - 2¹ = 12687841 is a prime.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (12687841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10096 + ... + 11282.

It is an arithmetic number, because the mean of its divisors is an integer number (1211760).

Almost surely, 2^12687843 is an apocalyptic number.

12687843 is a deficient number, since it is larger than the sum of its proper divisors (6700317).

12687843 is a wasteful number, since it uses less digits than its factorization.

12687843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706.

The product of its digits is 64512, while the sum is 39.

The square root of 12687843 is about 3561.9998596294. Note that the first 3 decimals coincide. The cubic root of 12687843 is about 233.2361865433.

It can be divided in two parts, 12687 and 843, that added together give a triangular number (13530 = T₁₆₄).

The spelling of 12687843 in words is "twelve million, six hundred eighty-seven thousand, eight hundred forty-three".