2209723 has 4 divisors (see below), whose sum is σ = 2213728. Its totient is φ = 2205720.

The previous prime is 2209721. The next prime is 2209741. The reversal of 2209723 is 3279022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3279022 = 2 ⋅1639511.

It is a cyclic number.

It is not a de Polignac number, because 2209723 - 2¹ = 2209721 is a prime.

It is a d-powerful number, because it can be written as 2¹⁴ + 2¹⁸ + 0 + 9⁵ + 7⁷ + 2²⁰ + 3³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2209721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011 + ... + 2332.

It is an arithmetic number, because the mean of its divisors is an integer number (553432).

2^2209723 is an apocalyptic number.

2209723 is a deficient number, since it is larger than the sum of its proper divisors (4005).

2209723 is an equidigital number, since it uses as much as digits as its factorization.

2209723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 2209723 is about 1486.5137066304. The cubic root of 2209723 is about 130.2504638806.

The spelling of 2209723 in words is "two million, two hundred nine thousand, seven hundred twenty-three".