2165520 has 80 divisors (see below), whose sum is σ = 7678080. Its totient is φ = 494592.

The previous prime is 2165483. The next prime is 2165521. The reversal of 2165520 is 255612.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2165521) 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, 1036 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (95976).

2^2165520 is an apocalyptic number.

2165520 is a gapful number since it is divisible by the number (20) 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 2165520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3839040).

2165520 is an abundant number, since it is smaller than the sum of its proper divisors (5512560).

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

2165520 is a wasteful number, since it uses less digits than its factorization.

2165520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312 (or 1306 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2165520 is about 1471.5705895403. The cubic root of 2165520 is about 129.3761032836.

The spelling of 2165520 in words is "two million, one hundred sixty-five thousand, five hundred twenty".