12213978 has 32 divisors (see below), whose sum is σ = 28571136. Its totient is φ = 3408048.

The previous prime is 12213947. The next prime is 12213991. The reversal of 12213978 is 87931221.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576 + ... + 5187.

It is an arithmetic number, because the mean of its divisors is an integer number (892848).

Almost surely, 2^12213978 is an apocalyptic number.

12213978 is an abundant number, since it is smaller than the sum of its proper divisors (16357158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12213978 is a wasteful number, since it uses less digits than its factorization.

12213978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818.

The product of its digits is 6048, while the sum is 33.

The square root of 12213978 is about 3494.8502113825. The cubic root of 12213978 is about 230.2956374739.

The spelling of 12213978 in words is "twelve million, two hundred thirteen thousand, nine hundred seventy-eight".