12216878 has 4 divisors (see below), whose sum is σ = 18325320. Its totient is φ = 6108438.

The previous prime is 12216877. The next prime is 12216901. The reversal of 12216878 is 87861221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87861221 = 7 ⋅12551603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12216877) by changing a digit.

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 as a sum of consecutive naturals, namely, 3054218 + ... + 3054221.

It is an arithmetic number, because the mean of its divisors is an integer number (4581330).

Almost surely, 2^12216878 is an apocalyptic number.

12216878 is a deficient number, since it is larger than the sum of its proper divisors (6108442).

12216878 is an equidigital number, since it uses as much as digits as its factorization.

12216878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6108441.

The product of its digits is 10752, while the sum is 35.

The square root of 12216878 is about 3495.2650829372. The cubic root of 12216878 is about 230.3138626173.

The spelling of 12216878 in words is "twelve million, two hundred sixteen thousand, eight hundred seventy-eight".