12800005 has 8 divisors (see below), whose sum is σ = 15384600. Its totient is φ = 10223616.

The previous prime is 12799987. The next prime is 12800009. The reversal of 12800005 is 50000821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 564001 + 12236004 = 751^2 + 3498^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12800005 - 2⁵ = 12799973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12800009) 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, 2181 + ... + 5509.

It is an arithmetic number, because the mean of its divisors is an integer number (1923075).

Almost surely, 2^12800005 is an apocalyptic number.

It is an amenable number.

12800005 is a deficient number, since it is larger than the sum of its proper divisors (2584595).

12800005 is an equidigital number, since it uses as much as digits as its factorization.

12800005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103.

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

The square root of 12800005 is about 3577.7094627708. The cubic root of 12800005 is about 233.9214495155.

Adding to 12800005 its reverse (50000821), we get a palindrome (62800826).

The spelling of 12800005 in words is "twelve million, eight hundred thousand, five".