12709861 has 4 divisors (see below), whose sum is σ = 12720492. Its totient is φ = 12699232.

The previous prime is 12709847. The next prime is 12709871. The reversal of 12709861 is 16890721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16890721 = 311 ⋅54311.

It can be written as a sum of positive squares in 2 ways, for example, as 7257636 + 5452225 = 2694^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 12709861 - 2⁷ = 12709733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12709871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3256 + ... + 6001.

It is an arithmetic number, because the mean of its divisors is an integer number (3180123).

Almost surely, 2^12709861 is an apocalyptic number.

It is an amenable number.

12709861 is a deficient number, since it is larger than the sum of its proper divisors (10631).

12709861 is an equidigital number, since it uses as much as digits as its factorization.

12709861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10630.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 12709861 is about 3565.0891994451. The cubic root of 12709861 is about 233.3710249769.

The spelling of 12709861 in words is "twelve million, seven hundred nine thousand, eight hundred sixty-one".