12278216 has 16 divisors (see below), whose sum is σ = 24376140. Its totient is φ = 5777920.

The previous prime is 12278209. The next prime is 12278221. The reversal of 12278216 is 61287221.

It can be written as a sum of positive squares in 2 ways, for example, as 11930116 + 348100 = 3454^2 + 590^2 .

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, 45005 + ... + 45276.

Almost surely, 2^12278216 is an apocalyptic number.

It is an amenable number.

12278216 is a deficient number, since it is larger than the sum of its proper divisors (12097924).

12278216 is a wasteful number, since it uses less digits than its factorization.

12278216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90304 (or 90300 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 12278216 is about 3504.0285386966. The cubic root of 12278216 is about 230.6986694583.

The spelling of 12278216 in words is "twelve million, two hundred seventy-eight thousand, two hundred sixteen".