12684215 has 4 divisors (see below), whose sum is σ = 15221064. Its totient is φ = 10147368.

The previous prime is 12684209. The next prime is 12684241. The reversal of 12684215 is 51248621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51248621 = 5737 ⋅8933.

It is a cyclic number.

It is not a de Polignac number, because 12684215 - 2²⁰ = 11635639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1268417 + ... + 1268426.

It is an arithmetic number, because the mean of its divisors is an integer number (3805266).

Almost surely, 2^12684215 is an apocalyptic number.

12684215 is a deficient number, since it is larger than the sum of its proper divisors (2536849).

12684215 is an equidigital number, since it uses as much as digits as its factorization.

12684215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536848.

The product of its digits is 3840, while the sum is 29.

The square root of 12684215 is about 3561.4905587408. The cubic root of 12684215 is about 233.2139536718.

The spelling of 12684215 in words is "twelve million, six hundred eighty-four thousand, two hundred fifteen".