12856665 has 16 divisors (see below), whose sum is σ = 20909376. Its totient is φ = 6744000.

The previous prime is 12856651. The next prime is 12856667. The reversal of 12856665 is 56665821.

It is not a de Polignac number, because 12856665 - 2⁶ = 12856601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12856667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6111 + ... + 7940.

It is an arithmetic number, because the mean of its divisors is an integer number (1306836).

Almost surely, 2^12856665 is an apocalyptic number.

12856665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12856665 is a deficient number, since it is larger than the sum of its proper divisors (8052711).

12856665 is a wasteful number, since it uses less digits than its factorization.

12856665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14120.

The product of its digits is 86400, while the sum is 39.

The square root of 12856665 is about 3585.6191933891. The cubic root of 12856665 is about 234.2660973172.

The spelling of 12856665 in words is "twelve million, eight hundred fifty-six thousand, six hundred sixty-five".