12868409 has 4 divisors (see below), whose sum is σ = 12878580. Its totient is φ = 12858240.

The previous prime is 12868399. The next prime is 12868411. The reversal of 12868409 is 90486821.

12868409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 90486821 = 419 ⋅215959.

It can be written as a sum of positive squares in 2 ways, for example, as 8880400 + 3988009 = 2980^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 12868409 - 2⁴ = 12868393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12868469) 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, 2864 + ... + 5825.

It is an arithmetic number, because the mean of its divisors is an integer number (3219645).

Almost surely, 2^12868409 is an apocalyptic number.

It is an amenable number.

12868409 is a deficient number, since it is larger than the sum of its proper divisors (10171).

12868409 is an equidigital number, since it uses as much as digits as its factorization.

12868409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10170.

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

The square root of 12868409 is about 3587.2564725706. The cubic root of 12868409 is about 234.3374062132.

The spelling of 12868409 in words is "twelve million, eight hundred sixty-eight thousand, four hundred nine".