12902809 has 4 divisors (see below), whose sum is σ = 13023504. Its totient is φ = 12782116.

The previous prime is 12902807. The next prime is 12902831. The reversal of 12902809 is 90820921.

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 12902809 - 2¹ = 12902807 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12902801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60187 + ... + 60400.

It is an arithmetic number, because the mean of its divisors is an integer number (3255876).

Almost surely, 2^12902809 is an apocalyptic number.

It is an amenable number.

12902809 is a deficient number, since it is larger than the sum of its proper divisors (120695).

12902809 is a wasteful number, since it uses less digits than its factorization.

12902809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120694.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 12902809 is about 3592.0480230643. The cubic root of 12902809 is about 234.5460317010.

The spelling of 12902809 in words is "twelve million, nine hundred two thousand, eight hundred nine".