12185978 has 16 divisors (see below), whose sum is σ = 21245760. Its totient is φ = 5133696.

The previous prime is 12185959. The next prime is 12185981. The reversal of 12185978 is 87958121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6551 + ... + 8202.

It is an arithmetic number, because the mean of its divisors is an integer number (1327860).

Almost surely, 2^12185978 is an apocalyptic number.

12185978 is a deficient number, since it is larger than the sum of its proper divisors (9059782).

12185978 is a wasteful number, since it uses less digits than its factorization.

12185978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14821.

The product of its digits is 40320, while the sum is 41.

The square root of 12185978 is about 3490.8420187685. The cubic root of 12185978 is about 230.1195219993.

The spelling of 12185978 in words is "twelve million, one hundred eighty-five thousand, nine hundred seventy-eight".