12109878 has 128 divisors (see below), whose sum is σ = 32832000. Its totient is φ = 3265920.

The previous prime is 12109873. The next prime is 12109901. The reversal of 12109878 is 87890121.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12109873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 327276 + ... + 327312.

It is an arithmetic number, because the mean of its divisors is an integer number (256500).

Almost surely, 2^12109878 is an apocalyptic number.

12109878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12109878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16416000).

12109878 is an abundant number, since it is smaller than the sum of its proper divisors (20722122).

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

12109878 is a wasteful number, since it uses less digits than its factorization.

12109878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 12109878 is about 3479.9249991918. The cubic root of 12109878 is about 229.6394982572.

Adding to 12109878 its reverse (87890121), we get a palindrome (99999999).

The spelling of 12109878 in words is "twelve million, one hundred nine thousand, eight hundred seventy-eight".