Properties of the Number 380

Three Hundred Eighty

Basics

Value: 379 → 380 → 381

Parity: even

Prime: No

Previous Prime: 379

Next Prime: 383

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 19

Divisors: 1, 2, 4, 5, 10, 19, 20, 38, 76, 95

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101111100

Octal: 574

Duodecimal: 278

Hexadecimal: 17c

Square: 144400

Square Root: 19.493588689617926

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

Oblong (or promic, pronic, or heteromecic) numbers: a(n) = n*(n+1). A2378

Quarter-squares: a(n) = floor(n/2)*ceiling(n/2). Equivalently, a(n) = floor(n²/4). A2620

Multiples of 10: a(n) = 10·n. A8592

Triangle read by rows: T(n,m) (n >= m >= 1) = number of regions (or cells) formed by drawing the line segments connecting any two of the 2*(m+n) perimeter points of an m X n grid of squares. A331452

Number of subsets of {1..n} containing all of their pairwise sums <= n. A326083

Number of partitions of n into distinct parts such that number of parts is odd. A67659

a(n) = 2·n*(2·n-1). A2939

a(n) = n*σ(n). A64987

Number of parts in all partitions of n into distinct parts. A15723

a(n) = 8·n + 4. A17113