Properties of the Number 1380

One Thousand Three Hundred Eighty

Basics

Value: 1379 → 1380 → 1381

Parity: even

Prime: No

Previous Prime: 1373

Next Prime: 1381

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 23

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101100100

Octal: 2544

Duodecimal: 970

Hexadecimal: 564

Square: 1904400

Square Root: 37.14835124201342

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of nodes in regular n-gon with all diagonals drawn. A7569

Numbers n such that (n! + 2)/2 is a prime. A82672

Sum of smallest parts of all partitions of n. A46746

Number of partitions of 2n in which every part is <n+1; also, the number of partitions of 2 into rational numbers a/b such that 0<a<=b<=n and b divides n. A209816

The n-th n-gonal number: a(n) = n*(n² - 3·n + 4)/2. A60354

5 times triangular numbers: a(n) = 5·n*(n+1)/2. A28895

Number of subsets of {1..n} (including empty set) such that the pairwise sums of distinct elements are all distinct. A196723

Number of partitions of n into nonsquares. A87153

Generalized 15-gonal (or pentadecagonal) numbers: n*(13·n - 11)/2, n = 0,+1,-1,+2,-2,+3,-3, ... A277082

Triangular matrix T, read by rows, where row n of T equals row (n-1) of Tⁿ⁺¹ with an appended '1'. A121412