12109640 has 32 divisors (see below), whose sum is σ = 27466560. Its totient is φ = 4804800.

The previous prime is 12109633. The next prime is 12109649. The reversal of 12109640 is 4690121.

It is a happy number.

It is a Smith number, since the sum of its digits (23) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (12109649) 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 7 ways as a sum of consecutive naturals, for example, 4085 + ... + 6395.

It is an arithmetic number, because the mean of its divisors is an integer number (858330).

Almost surely, 2^12109640 is an apocalyptic number.

12109640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12109640 is an abundant number, since it is smaller than the sum of its proper divisors (15356920).

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

12109640 is a wasteful number, since it uses less digits than its factorization.

12109640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2453 (or 2449 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 12109640 is about 3479.8908028845. The cubic root of 12109640 is about 229.6379938501.

Adding to 12109640 its reverse (4690121), we get a palindrome (16799761).

The spelling of 12109640 in words is "twelve million, one hundred nine thousand, six hundred forty".