12115978 has 16 divisors (see below), whose sum is σ = 21441024. Its totient is φ = 5024880.

The previous prime is 12115969. The next prime is 12116011. The reversal of 12115978 is 87951121.

It is a happy number.

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, 13525 + ... + 14392.

It is an arithmetic number, because the mean of its divisors is an integer number (1340064).

Almost surely, 2^12115978 is an apocalyptic number.

12115978 is a deficient number, since it is larger than the sum of its proper divisors (9325046).

12115978 is a wasteful number, since it uses less digits than its factorization.

12115978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27957.

The product of its digits is 5040, while the sum is 34.

The square root of 12115978 is about 3480.8013445182. The cubic root of 12115978 is about 229.6780498649.

The spelling of 12115978 in words is "twelve million, one hundred fifteen thousand, nine hundred seventy-eight".