12997209 has 8 divisors (see below), whose sum is σ = 17613952. Its totient is φ = 8522640.

The previous prime is 12997207. The next prime is 12997213. The reversal of 12997209 is 90279921.

It is a happy number.

12997209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12997209 - 2¹ = 12997207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12997207) 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 7 ways as a sum of consecutive naturals, for example, 35329 + ... + 35694.

It is an arithmetic number, because the mean of its divisors is an integer number (2201744).

Almost surely, 2^12997209 is an apocalyptic number.

It is an amenable number.

12997209 is a deficient number, since it is larger than the sum of its proper divisors (4616743).

12997209 is an equidigital number, since it uses as much as digits as its factorization.

12997209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71087.

The product of its (nonzero) digits is 20412, while the sum is 39.

The square root of 12997209 is about 3605.1642126261. The cubic root of 12997209 is about 235.1166404520.

The spelling of 12997209 in words is "twelve million, nine hundred ninety-seven thousand, two hundred nine".