2159723 has 4 divisors (see below), whose sum is σ = 2253648. Its totient is φ = 2065800.

The previous prime is 2159719. The next prime is 2159767. The reversal of 2159723 is 3279512.

2159723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2159723 - 2² = 2159719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159713) 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 3 ways as a sum of consecutive naturals, for example, 46928 + ... + 46973.

It is an arithmetic number, because the mean of its divisors is an integer number (563412).

2^2159723 is an apocalyptic number.

2159723 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2159723 is a deficient number, since it is larger than the sum of its proper divisors (93925).

2159723 is an equidigital number, since it uses as much as digits as its factorization.

2159723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93924.

The product of its digits is 3780, while the sum is 29.

The square root of 2159723 is about 1469.5996053347. The cubic root of 2159723 is about 129.2605554397.

It can be divided in two parts, 2159 and 723, that added together give a palindrome (2882).

The spelling of 2159723 in words is "two million, one hundred fifty-nine thousand, seven hundred twenty-three".