22723209 has 12 divisors (see below), whose sum is σ = 32884852. Its totient is φ = 15120000.

The previous prime is 22723199. The next prime is 22723277. The reversal of 22723209 is 90232722.

It can be written as a sum of positive squares in 2 ways, for example, as 9437184 + 13286025 = 3072^2 + 3645^2 .

It is not a de Polignac number, because 22723209 - 2⁴ = 22723193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22723289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3309 + ... + 7509.

Almost surely, 2^22723209 is an apocalyptic number.

It is an amenable number.

22723209 is a deficient number, since it is larger than the sum of its proper divisors (10161643).

22723209 is a wasteful number, since it uses less digits than its factorization.

22723209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4808 (or 4805 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 22723209 is about 4766.8867198623. The cubic root of 22723209 is about 283.2412839006.

It can be divided in two parts, 227 and 23209, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 22723209 in words is "twenty-two million, seven hundred twenty-three thousand, two hundred nine".