12800909 has 4 divisors (see below), whose sum is σ = 13964640. Its totient is φ = 11637180.

The previous prime is 12800891. The next prime is 12800929. The reversal of 12800909 is 90900821.

12800909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12800909 - 2⁸ = 12800653 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12800929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581849 + ... + 581870.

It is an arithmetic number, because the mean of its divisors is an integer number (3491160).

Almost surely, 2^12800909 is an apocalyptic number.

It is an amenable number.

12800909 is a deficient number, since it is larger than the sum of its proper divisors (1163731).

12800909 is a wasteful number, since it uses less digits than its factorization.

12800909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163730.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 12800909 is about 3577.8357983563. The cubic root of 12800909 is about 233.9269562845.

The spelling of 12800909 in words is "twelve million, eight hundred thousand, nine hundred nine".