12165440 has 56 divisors (see below), whose sum is σ = 33113472. Its totient is φ = 4170240.

The previous prime is 12165427. The next prime is 12165443. The reversal of 12165440 is 4456121.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12165443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476 + ... + 4955.

It is an arithmetic number, because the mean of its divisors is an integer number (591312).

Almost surely, 2^12165440 is an apocalyptic number.

12165440 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 12165440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16556736).

12165440 is an abundant number, since it is smaller than the sum of its proper divisors (20948032).

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

12165440 is an equidigital number, since it uses as much as digits as its factorization.

12165440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5455 (or 5445 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 12165440 is about 3487.8990811089. The cubic root of 12165440 is about 229.9901697122.

The spelling of 12165440 in words is "twelve million, one hundred sixty-five thousand, four hundred forty".