12857409 has 6 divisors (see below), whose sum is σ = 18571826. Its totient is φ = 8571600.

The previous prime is 12857407. The next prime is 12857413. The reversal of 12857409 is 90475821.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 5184 = 3585^2 + 72^2 .

It is not a de Polignac number, because 12857409 - 2¹ = 12857407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12857407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 714292 + ... + 714309.

Almost surely, 2^12857409 is an apocalyptic number.

It is an amenable number.

12857409 is a deficient number, since it is larger than the sum of its proper divisors (5714417).

12857409 is a wasteful number, since it uses less digits than its factorization.

12857409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1428607 (or 1428604 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 12857409 is about 3585.7229396594. The cubic root of 12857409 is about 234.2706161307.

The spelling of 12857409 in words is "twelve million, eight hundred fifty-seven thousand, four hundred nine".