Using the bitcoin client...
>bitcoin-cli getblockhash 1492
000000002590c6bd1c26c7afffb1dfb621950be4a6d9b89d019455c982997368
>bitcoin-cli getblock "000000002590c6bd1c26c7afffb1dfb621950be4a6d9b89d019455c982997368" true
{
"hash": "000000002590c6bd1c26c7afffb1dfb621950be4a6d9b89d019455c982997368",
"confirmations": 399504,
"size": 216,
"height": 1492,
"version": 1,
"merkleroot": "5c24d1f94f5315b8d9808f83e18a1dfce2dcfd1c4f3cae1241f38647908b1a76",
"tx": [
"5c24d1f94f5315b8d9808f83e18a1dfce2dcfd1c4f3cae1241f38647908b1a76"
],
"time": 1232763992,
"mediantime": 1232762084,
"nonce": 3780540712,
"bits": "1d00ffff",
"difficulty": 1,
"chainwork": "000000000000000000000000000000000000000000000000000005d505d505d5",
"previousblockhash": "00000000b7f525ddd961b69117ec21f5fc253af5a60be885a72cab6cc65b4adc",
"nextblockhash": "00000000c3a7bc56d1eaace7a174de16999db9e747aeec41ab62318f812b2678"
}
Hope this helps