2165723 has 8 divisors (see below), whose sum is σ = 2484192. Its totient is φ = 1849536.

The previous prime is 2165711. The next prime is 2165741. The reversal of 2165723 is 3275612.

2165723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2165723 - 2⁴ = 2165707 is a prime.

It is a super-2 number, since 2×2165723² = 9380712225458, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165692 and 2165701.

It is not an unprimeable number, because it can be changed into a prime (2165773) 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 7 ways as a sum of consecutive naturals, for example, 2861 + ... + 3537.

It is an arithmetic number, because the mean of its divisors is an integer number (310524).

2^2165723 is an apocalyptic number.

2165723 is a deficient number, since it is larger than the sum of its proper divisors (318469).

2165723 is an equidigital number, since it uses as much as digits as its factorization.

2165723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1141.

The product of its digits is 2520, while the sum is 26.

The square root of 2165723 is about 1471.6395618493. The cubic root of 2165723 is about 129.3801458120.

The spelling of 2165723 in words is "two million, one hundred sixty-five thousand, seven hundred twenty-three".