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Properties of the Number 2745

Two Thousand Seven Hundred Forty-Five

Basics

Value: 2744 → 2745 → 2746

Parity: odd

Prime: No

Previous Prime: 2741

Next Prime: 2749

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 2 × 5 × 61

Divisors: 1, 3, 5, 9, 15, 45, 61, 183, 305, 549

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101010111001

Octal: 5271

Duodecimal: 1709

Hexadecimal: ab9

Square: 7535025

Square Root: 52.392747589718944

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

Narayana's cows sequence: a(0) = a(1) = a(2) = 1; thereafter a(n) = a(n-1) + a(n-3). A930
Bisection of A000930. A2478
Partial sums of sequence of odd primes (A065091); a(n) = sum of the first n odd primes. A71148
a(n) = n3 + 1. A1093
Number of partitions of n that do not contain 2 as a part. A27336
a(n) = a(n-1) + a(n-3) for n >= 3, with a(0) = 1, a(1) = a(2) = 0. This recurrence can also be used to define a(n) for n < 0. A78012
Generalized 25-gonal (or icosipentagonal) numbers: m*(23·m - 21)/2 with m = 0, +1, -1, +2, -2, +3, -3, ... A303304
Generalized 28-gonal (or icosioctagonal) numbers: m*(13·m - 12) with m = 0, +1, -1, +2, -2, +3, -3, ... A303812
Number of incomplete integer partitions of n, meaning not every number from 0 to n is the sum of some submultiset. A365924
Triangle T(n,k) represents the coefficients of (x9*d/dx)n, where n=1,2,3,...;generalization of Stirling numbers of second kind A008277, Lah-numbers A008297. A223511