12215867 has 4 divisors (see below), whose sum is σ = 12261216. Its totient is φ = 12170520.

The previous prime is 12215851. The next prime is 12215897. The reversal of 12215867 is 76851221.

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

It is a cyclic number.

It is not a de Polignac number, because 12215867 - 2⁴ = 12215851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12215807) 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, 22268 + ... + 22809.

It is an arithmetic number, because the mean of its divisors is an integer number (3065304).

Almost surely, 2^12215867 is an apocalyptic number.

12215867 is a deficient number, since it is larger than the sum of its proper divisors (45349).

12215867 is an equidigital number, since it uses as much as digits as its factorization.

12215867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45348.

The product of its digits is 6720, while the sum is 32.

The square root of 12215867 is about 3495.1204557211. The cubic root of 12215867 is about 230.3075092827.

The spelling of 12215867 in words is "twelve million, two hundred fifteen thousand, eight hundred sixty-seven".