2165939 has 8 divisors (see below), whose sum is σ = 2259840. Its totient is φ = 2073600.

The previous prime is 2165929. The next prime is 2165941. The reversal of 2165939 is 9395612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165939 - 2¹² = 2161843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165899 and 2165908.

It is not an unprimeable number, because it can be changed into a prime (2165929) 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, 3059 + ... + 3699.

It is an arithmetic number, because the mean of its divisors is an integer number (282480).

2^2165939 is an apocalyptic number.

2165939 is a deficient number, since it is larger than the sum of its proper divisors (93901).

2165939 is a wasteful number, since it uses less digits than its factorization.

2165939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781.

The product of its digits is 14580, while the sum is 35.

The square root of 2165939 is about 1471.7129475547. The cubic root of 2165939 is about 129.3844469441.

The spelling of 2165939 in words is "two million, one hundred sixty-five thousand, nine hundred thirty-nine".