Properties of the Number -1928

Nine Hundred Twenty-Eight

Basics

Value: -1929 → -1928 → -1927

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 20

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 241

Divisors: 1, 2, 4, 8, 241, 482, 964, 1928

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -11110001000

Octal: -3610

Duodecimal: -1148

Hexadecimal: -788

Square: 3717184

Square Root: 43.9089968002003

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

Sequence is {a(4,n)}, where a(m,n) is defined at sequence A110665. A110669

Matrix inverse of triangle A121334, where A121334(n,k) = C( n*(n+1)/2 + n-k, n-k) for n>=k>=0. A121439

a(0) = -1 and a(n) = (-1)ⁿ⁺¹*(3·n² - n + 4)/2 for n >= 1. A173247

a(1) = 1; a(n+1) = a(n) +- (sum of digits of a(1) up to a(n)), with "+" when a(n) is odd, or "-" if even. A332058

Number of distinct values taken by 2²^...² (with n 2's and parentheses inserted in all possible ways). A2845

a(n) = (n + 3)² - 8. A28884

Numbers m such that there are precisely 15 groups of order m. A294156

Number of connected cyclic conjugacy classes of subgroups of the symmetric group. A218970

T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 5 6 or 7. A252384

Partial sums of A097988 (d₃(n)²). A330570