Properties of the Number 1690

One Thousand Six Hundred Ninety

Basics

Value: 1689 → 1690 → 1691

Parity: even

Prime: No

Previous Prime: 1669

Next Prime: 1693

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 × 5 × 13 ²

Divisors: 1, 2, 5, 10, 13, 26, 65, 130, 169, 338

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 11010011010

Octal: 3232

Duodecimal: B8A

Hexadecimal: 69a

Square: 2856100

Square Root: 41.10960958218893

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 compositions (ordered partitions) of n into powers of 2. A23359

a(n) = 10·n². A33583

Number of integer partitions of n whose run-lengths are not unimodal. A332281

Goodstein sequence starting with 4: to calculate a(n+1), write a(n) in the hereditary representation in base n+2, then bump the base to n+3, then subtract 1. A56193

Numbers m that are the hypotenuse of exactly 7 distinct integer-sided right triangles, i.e., m² can be written as a sum of two squares in 7 ways. A97101

Numbers m such that there are precisely 10 groups of order m. A249553

a(n) = A005940(1+(3·A156552(n))). A332449

A triangle formed like generalized Pascal's triangle. The rule is T(n,k) = 2·T(n-1,k-1) + T(n-1,k), the left border is n and the right border is n² instead of 1. A228576

Concentric 10-gonal numbers. A195142

Sum of squares of unitary divisors of n. A34676