12809899 has 4 divisors (see below), whose sum is σ = 12857440. Its totient is φ = 12762360.

The previous prime is 12809879. The next prime is 12809921. The reversal of 12809899 is 99890821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12809899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12809809) 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, 23364 + ... + 23905.

It is an arithmetic number, because the mean of its divisors is an integer number (3214360).

Almost surely, 2^12809899 is an apocalyptic number.

12809899 is a deficient number, since it is larger than the sum of its proper divisors (47541).

12809899 is an equidigital number, since it uses as much as digits as its factorization.

12809899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47540.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 12809899 is about 3579.0919239382. The cubic root of 12809899 is about 233.9817052929.

The spelling of 12809899 in words is "twelve million, eight hundred nine thousand, eight hundred ninety-nine".