Properties of the Number -21438

Twenty-One Thousand Four Hundred Thirty-Eight

Basics

Value: -21439 → -21438 → -21437

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ³ × 397

Divisors: 1, 2, 3, 6, 9, 18, 27, 54, 397, 794

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

7925 Try Today's Challenge

Representations

Binary: -101001110111110

Octal: -51676

Duodecimal: -104A6

Hexadecimal: -53be

Square: 459587844

Square Root: 146.41721210294915

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

Thickened cube numbers: a(n) = n*(n² + (n-1)²) + (n-1)*2·n*(n-1). A50492

a(n) = ceiling((n³)/2). A36486

a(n) = ∑_{1 <= i <= j <= k <= n} gcd(i,j,k). A344521

Number of partitions of n³ into at most two parts. A274324

a(n) is the total sum of area over all (>=,>=)-polyominoes of length n. A382989

a(n) = (2·n³ + 5·n² - 5·n)/2. A162265

The number of orbits of 4-tuples of the dihedral group of order 2n acting on {1,2,...,n}. A236332

63-gonal numbers: a(n) = n*(61·n - 59)/2. A98140

σ(n)-n values in A085844. A216383

Number of sets of 4 distinct collinear points in an n X n permutation array in which leftmost pair has same spacing as rightmost pair. A234471