Factors of 840

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What are the factors of 840?

Answer

Factors of 840:

32 factors: 1, 2, 3, 4, 5 … 280, 420, 840

all 32 factors

1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840

32 factors · 840 = 2³ × 3 × 5 × 7 · composite

Underlined — prime: 2, 3, 5, 7 · 1 — neither prime nor composite · others — composite

Factor pairs of 840

1 × 840
2 × 420
3 × 280
4 × 210
5 × 168
6 × 140
7 × 120
8 × 105
…

√840 ≈ 28.98 — the last pair 28 × 30 sits here; past it pairs repeat.

all 16 pairs

1 × 840
2 × 420
3 × 280
4 × 210
5 × 168
6 × 140
7 × 120
8 × 105
10 × 84
12 × 70
14 × 60
15 × 56
20 × 42
21 × 40
24 × 35
28 × 30

840 = 2³ × 3 × 5 × 7 → (3 + 1) × (1 + 1) × (1 + 1) × (1 + 1) = 32 factors: add 1 to each exponent and multiply.

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See Also

Prime Number Checker - Find out whether a given number is Prime or not
Prime Factorization - Prime Factorization Calculator
Prime Numbers List - List of all Prime Numbers - how many Prime numbers are between

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Factors Table

Number	Factors
825	1, 3, 5, 11, 15, 25, 33, 55, 75, 165, 275, 825
826	1, 2, 7, 14, 59, 118, 413, 826
827	1, 827
828	1, 2, 3, 4, 6, 9, 12, 18, 23, 36, 46, 69, 92, 138, 207, 276, 414, 828
829	1, 829
830	1, 2, 5, 10, 83, 166, 415, 830
831	1, 3, 277, 831
832	1, 2, 4, 8, 13, 16, 26, 32, 52, 64, 104, 208, 416, 832
833	1, 7, 17, 49, 119, 833
834	1, 2, 3, 6, 139, 278, 417, 834
835	1, 5, 167, 835
836	1, 2, 4, 11, 19, 22, 38, 44, 76, 209, 418, 836
837	1, 3, 9, 27, 31, 93, 279, 837
838	1, 2, 419, 838
839	1, 839
840	1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840
841	1, 29, 841
842	1, 2, 421, 842
843	1, 3, 281, 843
844	1, 2, 4, 211, 422, 844
845	1, 5, 13, 65, 169, 845
846	1, 2, 3, 6, 9, 18, 47, 94, 141, 282, 423, 846
847	1, 7, 11, 77, 121, 847
848	1, 2, 4, 8, 16, 53, 106, 212, 424, 848
849	1, 3, 283, 849
850	1, 2, 5, 10, 17, 25, 34, 50, 85, 170, 425, 850
851	1, 23, 37, 851
852	1, 2, 3, 4, 6, 12, 71, 142, 213, 284, 426, 852
853	1, 853
854	1, 2, 7, 14, 61, 122, 427, 854

FAQ

What are the factors of 840?

Factors of 840: 32 factors: 1, 2, 3, 4, 5 … 280, 420, 840

How many factors does 840 have?

Number 840 has 32 factors

How many factor pairs does 840 have?

Number 840 has 16 factor pairs

Is 840 a prime or composite number?

Composite: 840 = 2³ × 3 × 5 × 7, so it has 32 factors — a prime has exactly two.

How many factors does 840 have excluding 1 and 840?

30 — all 32 factors except 1 and 840.