12705687 has 16 divisors (see below), whose sum is σ = 18945280. Its totient is φ = 8415576.

The previous prime is 12705659. The next prime is 12705697. The reversal of 12705687 is 78650721.

It is not a de Polignac number, because 12705687 - 2¹⁰ = 12704663 is a prime.

It is a super-2 number, since 2×12705687² = 322868964283938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12705617) 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, 2958 + ... + 5844.

It is an arithmetic number, because the mean of its divisors is an integer number (1184080).

Almost surely, 2^12705687 is an apocalyptic number.

12705687 is a deficient number, since it is larger than the sum of its proper divisors (6239593).

12705687 is a wasteful number, since it uses less digits than its factorization.

12705687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3059 (or 3053 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 12705687 is about 3564.5037522774. The cubic root of 12705687 is about 233.3454753319.

The spelling of 12705687 in words is "twelve million, seven hundred five thousand, six hundred eighty-seven".