12851865 has 40 divisors (see below), whose sum is σ = 24820488. Its totient is φ = 6324480.

The previous prime is 12851851. The next prime is 12851897. The reversal of 12851865 is 56815821.

It can be written as a sum of positive squares in 4 ways, for example, as 149769 + 12702096 = 387^2 + 3564^2 .

It is not a de Polignac number, because 12851865 - 2⁴ = 12851849 is a prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4045 + ... + 6485.

Almost surely, 2^12851865 is an apocalyptic number.

12851865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12851865 is a deficient number, since it is larger than the sum of its proper divisors (11968623).

12851865 is a wasteful number, since it uses less digits than its factorization.

12851865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471 (or 2462 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 12851865 is about 3584.9497904434. The cubic root of 12851865 is about 234.2369394903.

The spelling of 12851865 in words is "twelve million, eight hundred fifty-one thousand, eight hundred sixty-five".