Properties of the Number 3655

Three Thousand Six Hundred Fifty-Five

Basics

Value: 3654 → 3655 → 3656

Parity: odd

Prime: No

Previous Prime: 3643

Next Prime: 3659

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 17 × 43

Divisors: 1, 5, 17, 43, 85, 215, 731, 3655

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111001000111

Octal: 7107

Duodecimal: 2147

Hexadecimal: e47

Square: 13359025

Square Root: 60.45659600076736

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

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

Centered 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1. A60544

Bessel polynomial y_n(-1). A806

Triangle of Gaussian (or q-binomial) coefficients for q = -2. A15109

Generalized 26-gonal (or icosihexagonal) numbers: m*(12·m - 11) with m = 0, +1, -1, +2, -2, +3, -3, ... A316724

Number of loopless linear chord diagrams with n chords. A278990

a(n) = (2·n+1)*(4·n+1). A14634

a(n) = n*(n² - 6·n + 11)/6. A50407

Square array A(n,k), n >= 1, k >= 1, read by antidiagonals, where A(n,k) is the number of permutations of n copies of 1..k introduced in order 1..k with no element equal to another within a distance of 1. A322013

Numbers k such that k, k+1, k+2 and k+3 have the same number of divisors. A6601