12165720 has 96 divisors (see below), whose sum is σ = 42476400. Its totient is φ = 2779392.

The previous prime is 12165709. The next prime is 12165721. The reversal of 12165720 is 2756121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12165721) 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 23 ways as a sum of consecutive naturals, for example, 4846 + ... + 6914.

Almost surely, 2^12165720 is an apocalyptic number.

12165720 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 12165720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21238200).

12165720 is an abundant number, since it is smaller than the sum of its proper divisors (30310680).

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

12165720 is a wasteful number, since it uses less digits than its factorization.

12165720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097 (or 2086 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 12165720 is about 3487.9392196539. The cubic root of 12165720 is about 229.9919341847.

The spelling of 12165720 in words is "twelve million, one hundred sixty-five thousand, seven hundred twenty".