Properties of the Number 1855

One Thousand Eight Hundred Fifty-Five

Basics

Value: 1854 → 1855 → 1856

Parity: odd

Prime: No

Previous Prime: 1847

Next Prime: 1861

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 7 × 53

Divisors: 1, 5, 7, 35, 53, 265, 371, 1855

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 11100111111

Octal: 3477

Duodecimal: 10A7

Hexadecimal: 73f

Square: 3441025

Square Root: 43.069710934716056

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

Second pentagonal numbers: a(n) = n*(3·n + 1)/2. A5449

Triangle T(n,k) of rencontres numbers (number of permutations of n elements with k fixed points). A8290

Number of nodes in regular n-gon with all diagonals drawn. A7569

Positive integers which apparently never result in a palindrome under repeated applications of the function A056964(x) = x + (x with digits reversed). A23108

Triangle read by rows: T(n,k) = number of partial derangements, that is, the number of permutations of n distinct, ordered items in which exactly k of the items are in their natural ordered positions, for n >= 0, k = n, n-1, ..., 1, 0. A98825

Triangle read by rows: T(n,k) is the number of permutations of [n] having k consecutive ascending pairs (0 <= k <= n-1). A10027

Number of balls in pyramid with base either a regular hexagon or a hexagon with alternate sides differing by 1 (balls in hexagonal pyramid of height n taken from hexagonal close-packing). A19298

Rencontres numbers: number of permutations of [n] with exactly one fixed point. A240

a(n) = (prime(n)² - 1)/24. A24702

Numbers k such that 2^k + 9 is prime. A57196