12809215 has 8 divisors (see below), whose sum is σ = 15786720. Its totient is φ = 9970272.

The previous prime is 12809191. The next prime is 12809221. The reversal of 12809215 is 51290821.

12809215 = 121² + 122² + ... + 342².

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 12809215 - 2²³ = 4420607 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34435 + ... + 34804.

It is an arithmetic number, because the mean of its divisors is an integer number (1973340).

Almost surely, 2^12809215 is an apocalyptic number.

12809215 is a deficient number, since it is larger than the sum of its proper divisors (2977505).

12809215 is an equidigital number, since it uses as much as digits as its factorization.

12809215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69281.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 12809215 is about 3578.9963676986. The cubic root of 12809215 is about 233.9775406403.

The spelling of 12809215 in words is "twelve million, eight hundred nine thousand, two hundred fifteen".