Accessing object property named with dollar sign in PowerShell

I have a JSON (array of objects) obtained via Invoke-RestMethod and I try to iterate trough them using foreach.
The property I’m interested to use as a filter is named "$value" and I cannot change this, being a COTS application.

foreach($item in $Result.value) {
        if ($item.properties.threadType) {
            Write-Host $item.properties.threadType
            if ($item.properties.threadType.$value -eq "1234567") {
                Write-Host $item.id
            }
        }
    }

Output of Write-Host $item.properties.threadType, if statements evaluates as false.

@{$type=System.String; $value=18792098}
@{$type=System.String; $value=N/A}
@{$type=System.String; $value=1234567}

Snippet of that JSON:

    ...
    "properties": {
        "threadType": {
            "$type": "System.String",
            "$value": "1234567"
        }
    },
    ...

How can I access $value property?
I’ve tried using

1. $item.properties.threadType.$value
2. $item.properties.threadType.value
3. even $item.properties.threadType['$value']

>Solution :

You can use quotation marks to qualify a member name – in this case you’ll want to use single-quotes to avoid expansion of $value as a variable expression:

if ($item.properties.threadType.'$value' -eq "1234567") { <# ... #> }