12857906 has 16 divisors (see below), whose sum is σ = 19861848. Its totient is φ = 6240000.

The previous prime is 12857893. The next prime is 12857909. The reversal of 12857906 is 60975821.

It can be written as a sum of positive squares in 4 ways, for example, as 11282881 + 1575025 = 3359^2 + 1255^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12857906.

It is not an unprimeable number, because it can be changed into a prime (12857909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10106 + ... + 11306.

Almost surely, 2^12857906 is an apocalyptic number.

12857906 is a deficient number, since it is larger than the sum of its proper divisors (7003942).

12857906 is a wasteful number, since it uses less digits than its factorization.

12857906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 12857906 is about 3585.7922416113. The cubic root of 12857906 is about 234.2736346496.

The spelling of 12857906 in words is "twelve million, eight hundred fifty-seven thousand, nine hundred six".