12857405 has 16 divisors (see below), whose sum is σ = 17376768. Its totient is φ = 9048000.

The previous prime is 12857381. The next prime is 12857407. The reversal of 12857405 is 50475821.

It is not a de Polignac number, because 12857405 - 2¹⁴ = 12841021 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 (12857407) 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, 2066 + ... + 5475.

It is an arithmetic number, because the mean of its divisors is an integer number (1086048).

Almost surely, 2^12857405 is an apocalyptic number.

It is an amenable number.

12857405 is a deficient number, since it is larger than the sum of its proper divisors (4519363).

12857405 is a wasteful number, since it uses less digits than its factorization.

12857405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7588.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 12857405 is about 3585.7223818918. The cubic root of 12857405 is about 234.2705918364.

The spelling of 12857405 in words is "twelve million, eight hundred fifty-seven thousand, four hundred five".