12805000 has 80 divisors (see below), whose sum is σ = 32473980. Its totient is φ = 4704000.

The previous prime is 12804983. The next prime is 12805007. The reversal of 12805000 is 50821.

It is a happy number.

It can be written as a sum of positive squares in 10 ways, for example, as 315844 + 12489156 = 562^2 + 3534^2 .

It is not an unprimeable number, because it can be changed into a prime (12805007) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 64902 + ... + 65098.

Almost surely, 2^12805000 is an apocalyptic number.

12805000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12805000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16236990).

12805000 is an abundant number, since it is smaller than the sum of its proper divisors (19668980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12805000 is a wasteful number, since it uses less digits than its factorization.

12805000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 12805000 is about 3578.4074670166. The cubic root of 12805000 is about 233.9518736100.

Adding to 12805000 its reverse (50821), we get a palindrome (12855821).

The spelling of 12805000 in words is "twelve million, eight hundred five thousand".