12109778 has 8 divisors (see below), whose sum is σ = 18750720. Its totient is φ = 5859540.

The previous prime is 12109697. The next prime is 12109817. The reversal of 12109778 is 87790121.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 97598 + ... + 97721.

It is an arithmetic number, because the mean of its divisors is an integer number (2343840).

Almost surely, 2^12109778 is an apocalyptic number.

12109778 is a deficient number, since it is larger than the sum of its proper divisors (6640942).

12109778 is a wasteful number, since it uses less digits than its factorization.

12109778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195352.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 12109778 is about 3479.9106310364. The cubic root of 12109778 is about 229.6388661557.

Adding to 12109778 its reverse (87790121), we get a palindrome (99899899).

The spelling of 12109778 in words is "twelve million, one hundred nine thousand, seven hundred seventy-eight".