12681686 has 4 divisors (see below), whose sum is σ = 19022532. Its totient is φ = 6340842.

The previous prime is 12681631. The next prime is 12681703. The reversal of 12681686 is 68618621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68618621 = 1951 ⋅35171.

It is a super-3 number, since 3×12681686³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3170420 + ... + 3170423.

It is an arithmetic number, because the mean of its divisors is an integer number (4755633).

Almost surely, 2^12681686 is an apocalyptic number.

12681686 is a deficient number, since it is larger than the sum of its proper divisors (6340846).

12681686 is an equidigital number, since it uses as much as digits as its factorization.

12681686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6340845.

The product of its digits is 27648, while the sum is 38.

The square root of 12681686 is about 3561.1354930696. The cubic root of 12681686 is about 233.1984531122.

The spelling of 12681686 in words is "twelve million, six hundred eighty-one thousand, six hundred eighty-six".