2165749 has 16 divisors (see below), whose sum is σ = 2488320. Its totient is φ = 1872640.

The previous prime is 2165747. The next prime is 2165771. The reversal of 2165749 is 9475612.

2165749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 2165749 - 2¹ = 2165747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165741) 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 15 ways as a sum of consecutive naturals, for example, 11244 + ... + 11434.

It is an arithmetic number, because the mean of its divisors is an integer number (155520).

2^2165749 is an apocalyptic number.

2165749 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2165749 is a deficient number, since it is larger than the sum of its proper divisors (322571).

2165749 is a wasteful number, since it uses less digits than its factorization.

2165749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260.

The product of its digits is 15120, while the sum is 34.

The square root of 2165749 is about 1471.6483955076. The cubic root of 2165749 is about 129.3806635560.

The spelling of 2165749 in words is "two million, one hundred sixty-five thousand, seven hundred forty-nine".