2165860 has 12 divisors (see below), whose sum is σ = 4548348. Its totient is φ = 866336.

The previous prime is 2165857. The next prime is 2165873. The reversal of 2165860 is 685612.

It can be written as a sum of positive squares in 2 ways, for example, as 272484 + 1893376 = 522^2 + 1376^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54127 + ... + 54166.

It is an arithmetic number, because the mean of its divisors is an integer number (379029).

2^2165860 is an apocalyptic number.

2165860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2165860 is an abundant number, since it is smaller than the sum of its proper divisors (2382488).

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

2165860 is a wasteful number, since it uses less digits than its factorization.

2165860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108302 (or 108300 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2165860 is about 1471.6861078369. The cubic root of 2165860 is about 129.3828738780.

It can be divided in two parts, 2165 and 860, that added together give a square (3025 = 55²).

The spelling of 2165860 in words is "two million, one hundred sixty-five thousand, eight hundred sixty".