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If we take the three-digit number 999 and write it in words as NINE HUNDRED AND NINETY-NINE we can see that its four elements have 4, 7, 3 and 10 letters. If we multiply 4 × 7 × 3 × 10 we get 840, which is some way away from the 999 that we started with.

I invite you to find a three-digit number such that if you multiply together the number of letters in each of its four elements you get the number that you started with.

What is that three-digit number?

WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 12 May. The Editor’s decision is final. Please send entries to Enigma 1590, New ÐÓ°ÉÔ­´´, Lacon House, 84 Theobald’s Road, London WC1X 8NS, or to enigma@newscientist.com (please include your postal address).

Answer to 1584 Trisquare: The number is 29

The winner George Bruce of Edinburgh, UK