12857649 has 24 divisors (see below), whose sum is σ = 20377728. Its totient is φ = 7187040.

The previous prime is 12857629. The next prime is 12857651. The reversal of 12857649 is 94675821.

It is not a de Polignac number, because 12857649 - 2⁷ = 12857521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12857649.

It is not an unprimeable number, because it can be changed into a prime (12857609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5979 + ... + 7839.

It is an arithmetic number, because the mean of its divisors is an integer number (849072).

Almost surely, 2^12857649 is an apocalyptic number.

It is an amenable number.

12857649 is a deficient number, since it is larger than the sum of its proper divisors (7520079).

12857649 is a wasteful number, since it uses less digits than its factorization.

12857649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925 (or 1918 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 12857649 is about 3585.7564055580. The cubic root of 12857649 is about 234.2720737753.

The spelling of 12857649 in words is "twelve million, eight hundred fifty-seven thousand, six hundred forty-nine".