12109900 has 72 divisors (see below), whose sum is σ = 29216880. Its totient is φ = 4320000.

The previous prime is 12109873. The next prime is 12109901. The reversal of 12109900 is 990121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (12109901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111046 + ... + 111154.

It is an arithmetic number, because the mean of its divisors is an integer number (405790).

Almost surely, 2^12109900 is an apocalyptic number.

12109900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12109900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14608440).

12109900 is an abundant number, since it is smaller than the sum of its proper divisors (17106980).

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

12109900 is a wasteful number, since it uses less digits than its factorization.

12109900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 12109900 is about 3479.9281601780. The cubic root of 12109900 is about 229.6396373190.

The spelling of 12109900 in words is "twelve million, one hundred nine thousand, nine hundred".