1040

1040 is a positive integer. Its prime factorization is 2^4 × 5 × 13, so it is a composite number. It is divisible by 2, 4, 5, 8, 10, 13, 16, 20, 40, 80, and 1040, among other divisors.

In Roman numerals, 1040 is written as MXL. In binary, it is represented as 10000010000.

As a calendar year, 1040 CE falls in the 11th century. In historical timelines, it is used to label events that occurred during that year or nearby years.

Form 1040 is the standard individual income tax return used in the United States to report income, deductions, credits, and to calculate tax liability or refund. It is issued by the Internal Revenue Service. Taxpayers may file the form annually, and it is commonly accompanied by schedules and other supplemental forms. Variants include 1040-SR for seniors and 1040-X for amended returns; the usual due date is around April 15, with extensions available.

Beyond mathematics and taxation, 1040 also appears as a model number or identifier in various products, industries, and systems. Its usage in these contexts is nonstandard and varies by manufacturer or organization.