12109812 has 48 divisors (see below), whose sum is σ = 33200832. Its totient is φ = 3386880.

The previous prime is 12109697. The next prime is 12109817. The reversal of 12109812 is 21890121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12109817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1813 + ... + 5244.

It is an arithmetic number, because the mean of its divisors is an integer number (691684).

Almost surely, 2^12109812 is an apocalyptic number.

12109812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12109812 is an abundant number, since it is smaller than the sum of its proper divisors (21091020).

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

12109812 is a wasteful number, since it uses less digits than its factorization.

12109812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088 (or 7086 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 12109812 is about 3479.9155162159. The cubic root of 12109812 is about 229.6390810706.

Adding to 12109812 its reverse (21890121), we get a palindrome (33999933).

It can be divided in two parts, 12109 and 812, that added together give a palindrome (12921).

The spelling of 12109812 in words is "twelve million, one hundred nine thousand, eight hundred twelve".