Properties of the Number 1128

One Thousand One Hundred Twenty-Eight

Basics

Value: 1127 → 1128 → 1129

Parity: even

Prime: No

Previous Prime: 1123

Next Prime: 1129

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ³ × 3 × 47

Divisors: 1, 2, 3, 4, 6, 8, 12, 24, 47, 94

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 10001101000

Octal: 2150

Duodecimal: 7A0

Hexadecimal: 468

Square: 1272384

Square Root: 33.58571124749333

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

Triangular numbers: a(n) = binomial(n+1,2) = n*(n+1)/2 = 0 + 1 + 2 + ... + n. A217

Hexagonal numbers: a(n) = n*(2·n-1). A384

a(n) = binomial(n,2): number of size-2 subsets of {0,1,...,n} that contain no consecutive integers. A161680

Triangular numbers (A000217) with prime indices. A34953

Schur's 1926 partition theorem: number of partitions of n into parts 6n+1 or 6n-1. A3105

Multiples of 12 containing a 12 in their decimal representation. A121032

Multiples of 8 containing an 8 in their decimal representation. A121028

Number of partitions of n for which the number of odd parts is equal to the positive alternating sum of the parts. A277103

Multiples of 24. A8606

Numbers k such that π(k) divides k. A57809